Question

HELP ME !!
Susannah purchased ski equipment for $978 using a six-month deferred payment plan. The interest rate after the introductory period is 21.45%. A down payment of $150 is required as well as a minimum monthly payment of $75. What is the balance at the beginning of the seventh month if only the minimum payment is made during the introductory period?

$470.87

$487.69

$845.87

$920.87