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+// This is a quiz for the following sections:
+// - Variables
+// - Functions
+// - If
+//
+// Mary is buying apples. The price of an apple is calculated as follows:
+// - An apple costs 2 rustbucks.
+// - However, if Mary buys more than 40 apples, the price of each apple in the
+// entire order is reduced to only 1 rustbuck!
+
+fn calculate_price_of_apples(n: i32) -> i32 {
+ if n > 40 {
+ n
+ } else {
+ 2 * n
+ }
+}
+
+fn main() {
+ // You can optionally experiment here.
+}
+
+// Don't change the tests!
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn verify_test() {
+ assert_eq!(calculate_price_of_apples(35), 70);
+ assert_eq!(calculate_price_of_apples(40), 80);
+ assert_eq!(calculate_price_of_apples(41), 41);
+ assert_eq!(calculate_price_of_apples(65), 65);
+ }
+}