1 files changed, 15 insertions, 2 deletions
diff --git a/rustlings/solutions/02_functions/functions4.rs b/rustlings/solutions/02_functions/functions4.rs
index dcf2377..f823de2 100644
--- a/rustlings/solutions/02_functions/functions4.rs
+++ b/rustlings/solutions/02_functions/functions4.rs
@@ -1,4 +1,17 @@
+fn is_even(num: i64) -> bool {
+    num % 2 == 0
+}
+
+// The return type must always be annotated.
+fn sale_price(price: i64) -> i64 {
+    if is_even(price) {
+        price - 10
+    } else {
+        price - 3
+    }
+}
+
 fn main() {
-    // DON'T EDIT THIS SOLUTION FILE!
-    // It will be automatically filled after you finish the exercise.
+    let original_price = 51;
+    println!("Your sale price is {}", sale_price(original_price));
 }