Please help me this question is very off for me

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

Wrote and expression for the difference of p and 4