added class RewardValue

src/main/java/RewardValue.java

@@ -0,0 +1,27 @@
+public class RewardValue {
+    private double cashValue;
+    private double milesValue;
+
+    private static final double MILES_TO_CASH_RATE = 0.0035;
+
+
+    public RewardValue(double cashValue) {
+        this.cashValue = cashValue;
+        this.milesValue = cashValue / MILES_TO_CASH_RATE;
+    }
+
+    public RewardValue(int milesValue) {
+        this.milesValue = milesValue;
+        this.cashValue = milesValue * MILES_TO_CASH_RATE;
+    }
+
+
+    public double getCashValue() {
+        return cashValue;
+    }
+
+
+    public double getMilesValue() {
+        return milesValue;
+    }
+}