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?

Answer 1

Lisa should have paid more then kelly in 11 months

Explanation:

Answer 2

Start by making a formula for the price of each gym:
Powerhouse has a $100 entry fee, the constant, leaving $35 to go with your variable. Lets say m, which gives you the equation:
100 + 30m
Repeat the same thing for Megamuscle gym and you have the equation:
50 + 35m
Insert numbers for m (number of months) from 1 - 12 until you get a number for Lisa that is larger than Kelly's, which would be 11 months.
Kelly would have paid $430, with Lisa paying $435 in 11 months.