Question 321189
Let x be the number of months that for such period of time, the total cost for each club are equal.
We have:
the total cost for joining club A for x months is: 28 + 15x
the total cost for joining club B for x months is: 24 + 16x
Since the cost for joining each club for x month are equal, we have the equation:
28 + 15x = 24 + 16x <->
4 = x.
So, after 4 month since joining, the total cost of joining both club are the same. And that same total cost is 28 + 15*4 = 88 ($).