A store's employees receive a 20% discount on all purchases. During a promotion, the store also advertised $10 off all purchases of more than $100. Let x represent the original price of an item. The function, E(x)=0.80x represents the employee discount price. The function C(x)=x-10 represents the promotional discount price. a. Determine a function, E(C(x)) and explain what it represents. (1 mark) b. Determine a function, C(E(x)), and explain what it represents. (1 mark) c. Use a number example to determine the better deal for the employee. (1 mark).