Tina has a pet sitting business. She charges a flat service fee of $20, plus $20 per day for each animal. If one of her customers spent less than $100 on one animal, which of the following inequalities could be used to solve for x, the number of days the customer paid for pet sitting?

Question

A.
$20x + $20 < $100
B.
$20x < $100
C.
$20x - $20 < $120
D.
$20x < $120

Answer 1

A. $20x + $20 < $100

This inequality states that the total cost for x days of pet sitting, plus the initial service fee of $20, is less than $100. This would be the correct inequality to solve for x, the number of days the customer paid for pet sitting.