Question

The relationship between the total amount spent on food and drinks by the customers that a waiter serves at a restaurant during a particular week and the waiter's total income for that week can be modeled by the equation y = 0.2x + 300, where x is the amount spent by the customers in dollars and y is the waiter's total income in dollars. By how much does the waiter's weekly income increase for every $500 spent by his customers during that week?
A.
$100

B.
$300

C.
$400

D.
$500

Answer 1

Slope = 0.2 means the waiter's income increases by 0.2 × x. For x = $500 the increase is 0.2 × 500 = $100.

Answer: A. $100