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diff --git a/functions/functions4.rs b/functions/functions4.rs
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+// Make me compile! Scroll down for hints :)
+
+// This store is having a sale where if the price is an even number, you get
+// 10 (money unit) off, but if it's an odd number, it's 3 (money unit) less.
+
+fn main() {
+    let original_price = 51;
+    println!("Your sale price is {}", sale_price(original_price));
+}
+
+fn sale_price(price: i32) -> {
+    if is_even(price) {
+        price - 10
+    } else {
+        price - 3
+    }
+}
+
+fn is_even(num: i32) -> bool {
+    num % 2 == 0
+}
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+// The error message points to line 10 and says it expects a type after the
+// `->`. This is where the function's return type should be-- take a look at
+// the `is_even` function for an example!