Drake borrows $5,478 from his friend. He repays $312 every month from his earnings. Choose the equation below that gives the amount left to repay, Bn, in the nth month. Then, use this equation to determine the amount left in the 8th month. A. Bn = $5,478 - $312·(n); B8 = $3,294 B. Bn = $5,478 - $312·(n - 1); B8 = $2,670 C. Bn = $5,478 - $312·(n); B8 = $2,670 D. Bn = $5,478 - $312·(n - 1); B8 = $3,294