Check for Mistakes in this Word Problem: check-total

Directions: It is customary to tip 20% on a bill at a restaurant. Write a function that takes the
total cost of the food and returns the new total including tip.

Contract and Purpose Statement

Every contract has three parts ...

;check-total:number→number

; Returns the total of a check with 20% of the cost added

Examples

Write some examples, then circle and label what changes ...

(EXAMPLE ((total 20))(20 (+ (0.2 * 20) 20))

(EXAMPLE ((total 56.67))(56.67 (+ (0.2 * 56.67) 56.67))

Definition

Write the definition, giving variable names to all your input values ...

(define (check-totalfood-total)(* (+ 0.2 food-total) food-total))