In: Finance
A bookstore offers you the following deal: you pay $33 today (in January) and you get 8%
off the price of everything you purchase in December (for simplicity assume exactly 12
months from now). If your savings account earns 3.08% APR (compounded monthly), how
much do you have to buy in December to just break even on the offer?
The amount you have to buy in December = ($33 / 8%) * (1 + 3.08% / 12)^12
= $412.50 * 1.0312385
= $425.39
The amount you have to buy in December = $425.39