done

src/main/java/com/example/test1/InteresDTO.java

+package com.example.test1;
+
+public class InteresDTO {
+    public double interes;
+}

src/main/java/com/example/test1/Saldo.java

@@ -3,9 +3,10 @@ package com.example.test1;
 
 
 public class Saldo {
+
     public double saldo;
 
-    Saldo (){}
+    Saldo (){this.saldo = 0;}
 
     Saldo(double saldo){
         this.saldo = saldo;
@@ -14,5 +15,6 @@ public class Saldo {
     double getSaldo(){
         return saldo;
     }
+
 }
 

src/main/java/com/example/test1/SaldoController.java

+package com.example.test1;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class SaldoController {
+
+    private final  TransaccionService transaccionService;
+
+
+    SaldoController(TransaccionService transaccionService){
+        this.transaccionService = transaccionService;
+    }
+
+
+    @GetMapping("/hello")
+    public String sayHello(@RequestParam(value = "myName", defaultValue = "World") String name) {
+        return String.format("Hello %s!", name);
+    }
+
+    @GetMapping("/saldo")
+    public Saldo returnSaldo() {
+        return transaccionService.getSaldoActual();
+    }
+
+}

src/main/java/com/example/test1/TransaccionController.java

 package com.example.test1;
 
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.List;
 
-@SpringBootApplication
 @RestController
 public class TransaccionController {
 
@@ -15,14 +14,14 @@ public class TransaccionController {
         this.transaccionService = transaccionService;
     }
 
-    @GetMapping("/hello")
-    public String sayHello(@RequestParam(value = "myName", defaultValue = "World") String name) {
-        return String.format("Hello %s!", name);
+    @GetMapping("/transacciones")
+    List<TransaccionModel> obtenerTransacciones() {
+        return transaccionService.obtenerTransacciones();
     }
 
-    @GetMapping("/saldo")
-    public Saldo returnSaldo() {
-        return new Saldo(1000);
+    @GetMapping("/extracciones")
+    List<TransaccionModel> obtenerExtracciones() {
+        return transaccionService.obtenerExtracciones();
     }
 
     @PostMapping("/deposito")
@@ -35,7 +34,10 @@ public class TransaccionController {
         return transaccionService.nuevaExtraccion(nuevaExtraccion);
     }
 
-  //  @PostMapping("/interes")
+    @PostMapping("/interes")
+    TransaccionModel nuevaExtraccion(@RequestBody InteresDTO extraccionDTO) {
+        return transaccionService.nuevoInteres(extraccionDTO.interes);
+    }
 
 
 

src/main/java/com/example/test1/TransaccionModel.java

@@ -10,7 +10,7 @@ public class TransaccionModel {
     private @Id
     @GeneratedValue Long id;
     public double monto;
-    public TRANSACTION_TYPE ttype;
+    private TRANSACTION_TYPE ttype;
 
     public TransaccionModel(double monto){
         this.monto = monto;
@@ -20,6 +20,10 @@ public class TransaccionModel {
 
     }
 
+    public void setType(TRANSACTION_TYPE ttype) {
+        this.ttype = ttype;
+    }
+
     public Long getId() {
         return this.id;
     }

src/main/java/com/example/test1/TransaccionRepository.java

@@ -3,7 +3,12 @@ package com.example.test1;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.stereotype.Repository;
 
+import java.util.List;
+
 @Repository
 public interface TransaccionRepository extends CrudRepository<TransaccionModel, Long> {
+    List<TransaccionModel> findTransaccionesByTtype(TransaccionModel.TRANSACTION_TYPE type);
+    List<TransaccionModel> findAll();
+    List<TransaccionModel> findAllByTtype(TransaccionModel.TRANSACTION_TYPE type);
 
 }
\ No newline at end of file

src/main/java/com/example/test1/TransaccionService.java

 package com.example.test1;
 
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
+import java.util.List;
+
 @Service
 public class TransaccionService {
 
@@ -12,15 +13,41 @@ public class TransaccionService {
         this.transaccionRepository = transaccionRepository;
     }
 
+
     public TransaccionModel nuevoDeposito(TransaccionModel transaccion){
-        transaccion.ttype = TransaccionModel.TRANSACTION_TYPE.DEPOSITO;
+        transaccion.setType(TransaccionModel.TRANSACTION_TYPE.DEPOSITO) ;
         return transaccionRepository.save(transaccion);
     }
 
     public TransaccionModel nuevaExtraccion(TransaccionModel transaccion){
         transaccion.monto *= -1;
-        transaccion.ttype = TransaccionModel.TRANSACTION_TYPE.EXTRACCION;
+        transaccion.setType(TransaccionModel.TRANSACTION_TYPE.EXTRACCION);
+        return transaccionRepository.save(transaccion);
+    }
+
+    public TransaccionModel nuevoInteres(double porcentaje){
+        TransaccionModel transaccion = new TransaccionModel();
+        transaccion.setType(TransaccionModel.TRANSACTION_TYPE.INTERES) ;
+        transaccion.monto = this.getSaldoActual().saldo * porcentaje / 100;
         return transaccionRepository.save(transaccion);
     }
 
+    public Saldo getSaldoActual() {
+        List<TransaccionModel> transacciones = this.obtenerTransacciones();
+
+        Saldo saldo = new Saldo();
+
+        for(TransaccionModel transaccion : transacciones) {
+            saldo.saldo += transaccion.monto;
+        }
+        return saldo;
+    }
+
+    public List<TransaccionModel> obtenerTransacciones() {
+        return transaccionRepository.findAll();
+    }
+
+    public List<TransaccionModel> obtenerExtracciones() {
+        return transaccionRepository.findAllByTtype(TransaccionModel.TRANSACTION_TYPE.EXTRACCION);
+    }
 }