Credit card a has an apr of 20.8% and an annual fee of $60, while credit card b has an apr of 24.6% and no annual fee. all else being equal, which of these equations can be used to solve for the principal, p, the amount at which the cards offer the same deal over the course of a year? (assume all interest is compounded monthly.) a. p•(1 + 0.208/12)12 - $60•12 = p•(1 + 0.246/12)12 b. p•(1 + 0.208/12)12 + $60•12 = p•(1 + 0.246/12)12 c. p•(1 + 0.208/12)12 - $60 = p•(1 + 0.246/12)12 d. p•(1 + 0.208/12)12 + $60 = p•(1 + 0.246/12)12