A health club charges non-members $12 per day along with an additional charge of $9 per day for a locker. the members pay a yearly fee of $300 and $6 per day for a locker. write and solve an equation to find how many times you must use the health club to justify becoming a member.

Respuesta :

Suppose that you use the health club x time  

When you will use it charged will=12+9=21

Equating both side

300+6x=21x

300=15x

X=20 member