finished exercise 39

Author: Jonathan-Birkey

src/com/github/jonathanbirkey/chapter05/Exercise39.java

@@ -2,14 +2,38 @@
  * @author : Jonathan Birkey
  * @mailto : [email protected]
  * @created : 28Feb2024
- *     <p>(Display leap years) Write a program that displays all the leap years, 10 per line, from
- *     101 to 2100, separated by exactly one space. Also display the number of leap years in this
- *     period.
+ *     <p>(Financial application: find the sales amount) You have just started a sales job in a
+ *     department store. Your pay consists of a base salary and a commission. The base salary is
+ *     $5,000. The scheme shown below is used to determine the commission rate.
+ *     <p>Sales Amount - Commission Rate
+ *     <p>$0.01–$5,000 - 8%
+ *     <p>$5,000.01–$10,000 - 10%
+ *     <p>$10,000.01 and above - 12%
+ *     <p>Note this is a graduated rate. The rate for the first $5,000 is at 8%, the next $5,000 is
+ *     at 10%, and the rest is at 12%. If the sales amount is 25,000, the commission is 5,000 * 8 +
+ *     5,000 * 10 + 15,000 * 12 = 2,700
+ *     <p>Your goal is to earn $30,000 a year. Write a program that finds out the minimum number of
+ *     sales you have to generate in order to make $30,000.
  */
 package com.github.jonathanbirkey.chapter05;
 
 public class Exercise39 {
   public static void main(String[] args) {
-    // TODO: solve
+    double baseSalary = 5000;
+    double commission = 0;
+    double desiredEarnings = 30000;
+    double sales = 0;
+
+    while (commission + baseSalary < desiredEarnings) {
+      if (sales <= 5000) {
+        commission = sales * 0.08;
+      } else if (sales <= 10000) {
+        commission = (5000 * 0.08) + ((sales - 5000) * 0.10);
+      } else {
+        commission = (5000 * 0.08) + (5000 * .10) + ((sales - 10000) * 0.12);
+      }
+      sales++;
+    }
+    System.out.printf("You would need to make $%.2f in sales to make at least $30,0000.", sales);
   }
-}
+}