Question

Kelly joins Powerhouse Gym. The cost is $30 per month and a one-time $100 joining fee. Lisa joins MegaMuscle Gym for $35 per month and a $50 joining fee. In how many months will Lisa have paid more than Kelly?

A) 10 months
B) 11 months
C) 8 months
D) 2 months

Answer 1

B- 11 months , Kelly would pay $430 and Lisa would pay $435


30 times 11 = 330 + 100= 430 -Kelly

35 times 11=385 + 50= 435

Answer 2

100 + 30x = 50 + 35x.
-50 -30x -50 -30x

50 = 5x

10 = x

At ten months they would have paid the same amount so at 11 months, Lisa would pay more than Kelly.