what is the percent increase, to the nearest whole percent, from the original cost of the laptop to the cost of the laptop if Marcos uses the payment plan?

Question

marcos wants to buy a used laptop that costs $630. There is an 8% tax on all purchases. The store offers a payment plan that requires a $100 down payment and then a payment of $90 each month for the next 8 months. what is the percent increase, to the nearest whole percent, from the original cost of the laptop to the cost of the laptop if Marcos uses the payment plan?

Answer 1

630*1.08=680.40

 

Under the payment plan:

  100+90*8 = 100+720 = 820

 

(820-680.40)/680.40 = 0.2051734274 = 20.51734274%