Question 393589
Let i = initiation fee, m = monthly fee.

Then we get the system
i + 2m = 100 <--(1)
i + 6m = 200 <--(2)
Subtracting the top equation from the bottom equation, we get

4m = 100, or m = $25, the monthly fee.
The initiation fee is i + 2*25 = 100,
==> i = 100 - 50 = $50