Cristina financed a $799 laptop with a 7.2% interest rate on a 2-year loan. if she can afford to make a $75 payment, how quickly can she pay off her laptop?

Your question is missing some elements but to answer the question I have to make an assumption.

Assuming that she make a monthly payment of $75.

The value of an loan at the end of the two year is given by



where PV = $799, r = 7.2% = 0.072 and n = 2 years.

Thus,



If she makes a monthly payment of $75, the number of months it will take her to pay off for her laptop is given by



Therefore, it will take her 13 months to pay off for the laptop.

The answer is that the rate of change is $50 per 1 monthhope this ; )