diff --git a/src/main/java/school/lemon/changerequest/java/banking/BankAccountImpl.java b/src/main/java/school/lemon/changerequest/java/banking/BankAccountImpl.java
new file mode 100644
index 0000000..b63bf6a
--- /dev/null
+++ b/src/main/java/school/lemon/changerequest/java/banking/BankAccountImpl.java
@@ -0,0 +1,66 @@
+package school.lemon.changerequest.java.banking;
+
+/**
+ * Created by lbrdev on 10.01.2017.
+ * Project: exceptions.hw1
+ */
+public class BankAccountImpl implements BankAccount {
+
+    double balance;
+    double rate;
+    int accountNumber;
+    double sum;
+    double newRate;
+
+    public BankAccountImpl() {
+        this.balance = 0;
+        this.rate = 0;
+        this.accountNumber = 0;
+    }
+
+    @Override
+    public int getAccountNumber() {
+        return accountNumber;
+    }
+
+    @Override
+    public double getBalance() {
+        return balance;
+    }
+
+    @Override
+    public double getRate() {
+        return rate;
+    }
+
+    @Override
+    public void setRate(double rate) {
+        rate = newRate;
+    }
+
+    @Override
+    public void withdraw(double sum) throws IllegalArgumentException {
+        if (balance < sum) {
+            throw new IllegalArgumentException("Not enough money for withdrawal");
+        }
+        balance = getBalance() - sum;
+    }
+
+    @Override
+    public void deposit(double sum) throws IllegalArgumentException {
+        balance = getBalance() + sum;
+    }
+
+    @Override
+    public void addInterest() {
+        balance = getBalance() + getBalance() * getRate();
+    }
+
+    @Override
+    public String toString() {
+        return ("Account#"
+                + getAccountNumber()
+                + ", ("
+                + "$" + getBalance() + ")");
+    }
+}
diff --git a/src/main/java/school/lemon/changerequest/java/banking/TestBA.java b/src/main/java/school/lemon/changerequest/java/banking/TestBA.java
new file mode 100644
index 0000000..9a4c6c5
--- /dev/null
+++ b/src/main/java/school/lemon/changerequest/java/banking/TestBA.java
@@ -0,0 +1,28 @@
+package school.lemon.changerequest.java.banking;
+
+/**
+ * Created by lbrdev on 10.01.2017.
+ * Project: exceptions.hw1
+ */
+public class TestBA {
+    public static void main(String[] args) {
+        BankAccountImpl bankAccount1 = new BankAccountImpl();
+
+        bankAccount1.balance = 15;
+        bankAccount1.rate = 10;
+        bankAccount1.accountNumber = 1;
+        bankAccount1.sum = 10;
+        bankAccount1.newRate = 11;
+
+        System.out.println("" + bankAccount1.toString());
+        bankAccount1.withdraw(bankAccount1.sum);
+        System.out.println("withdraw " + bankAccount1.balance );
+        bankAccount1.addInterest();
+        System.out.println("after addInterest" + bankAccount1.balance);
+        bankAccount1.setRate(bankAccount1.newRate);
+        bankAccount1.addInterest();
+        System.out.println("addInterst" + bankAccount1.balance);
+
+
+    }
+}