Option 1: $30 per month and $100 membership fee. option 2: $25 per month and $150 membership fee. michael is trying to determine which tennis club to join. if michael chooses option 2, for which month will his total cost for option 2 be less than his total cost for option 1? a) month 8 b) month 9 c) month 10 d) month 11

Let us say that m is the number of months. So that the equations for option 1 (O1) and option 2 (O2) are:

O1 = 30 m + 100

O2  = 25 m + 150

TO determine this, we equate O1 and O2 so that:

30 m + 100 = 25 m + 150

5 m = 50

m = 10

So at the 10th month, the cost for both options are equal. So we select month 11.

D) month 11

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