As manager of Fly-by-Night Airlines, you decide to allow customers

90 days to pay their bills. To encourage early payment, though, you allow them to reduce their bills by

0.70.7% if they pay within the first 47 days. At what implied effective annual interest rate are you loaning money to your customers? What if you extend the discount to

72 days and allow full payment up to 180 days?

At what implied effective annual interest rate are you loaning money to your customers?

nothing%

(Round to two decimal places.)