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| rev | Admin | (Created page with "'''Solution: E''' Note that had the borrower 1) charged X at the end of month 0, and 2) paid off the remaining 3000 at the beginning of month 16, then the initial and final balances would have become 0. In that situation, the present value of the amounts charged to the credit card, minus the present values of the payments, would have been 0 in the 15-month period. The amounts charged to the card were 79.99 at each of times <math>t=\frac{n-0.5}{12}</math>, for each whol...") | Nov 19'23 at 14:53 | +1,200 |