Question

Frank joined a fitness club. He paid a $50 registration fee, and dues are $12 per month. Which expression can be used to find the average monthly cost of an x-month membership at the club?
y=50+12/x
y=50+12x/x
y=50x+12/x
y=(50+12)x/x

Answer 1

Total cost for x months = registration + dues = 50 + 12x.
Average monthly cost = (total cost)/x = (50 + 12x)/x = 12 + 50/x.

None of the four given choices equals this expression, so the correct expression is y = (50 + 12x)/x (or y = 12 + 50/x).