precalculus

Question

a student is ineligible for financial aide needed to borrow $775,000 for tuition, books, and living expenses. Some money was borrowed at 8%, some at 9%, and some at 10%. How much was borrowed at each interest rate if the annual interest owed was $67,500 and the amount borrowed at 8% was four times the amount borrowed at 10%?

Answer 1

t represents the amount at 10%

t4 represents the amount at 8%

775000 - 5t represents the amount at 9%

 

0.10t + 0.08(4t) + 0.09(775000 - 5t) = 67500

 

Can you solve for t and answer?