Shaun received a credit card with an 21% nominal interest rate. With the card, he purchased an Tv for

$850. The minimum payment on the card is $60 per month.

a. If Shaun makes the minimum monthly payment and makes no other charges, how many months will it be before he

pays off the card?

b. If Simon makes monthly payments of $70, how many months will it be before he pays off the debt?

C. How much more in total payments will Simon make under the $70-a-month plan than under the $60-a-month plan?