Question

Planet Fitness charges a one-time membership fee of $25 and then a monthly charge of $10. Retro Fitness charges a one-time membership fee of $10 and then a monthly charge of $20. When is it less expensive to join Planet Fitness

Answer 1

Answer:

x < 3/2 month

Step-by-step explanation:

Let

x = number of months

Planet fitness:

25 + 10x

Retro fitness:

10 + 20x

Equate

25 + 10x < 10 + 20x

25 - 10 < 20x - 10x

15 < 10x

x < 15/10

x < 3/2 month

It is less expensive to join planet when the number of months is less than 3/2 months