Oliver is buying a new dishwasher. the dishwasher’s price is $285.10 after tax. he has a few payment options. he can put it on his debit card, which would take the money from his savings account. his savings account earns interest at a rate of 1.8% annually. he could also put it on one of two different credit cards. card a has an annual interest rate of 9%, charged monthly, and charges a flat 1.2% fee on the initial value of the purchase (note: the fee accrues interest too). card b has an annual interest rate of 12%, charged monthly, but no fee for purchases. oliver thinks it will take five months for him to earn the additional money to offset the purchase. in all cases, the interest accrues according to this equation: answer for all possibilities