6. How long will it take for P 35 200 to earn P 7 400 if invested at 5 12% simple interest? Answer: 1= 7. What simple interest rate is applied if P 5 000 becomes P 5 500 in 100 days? Answer: r= 8. Mr. de Leon borrowed some money at the rate of 5% per annum for the first 2 years, at the rate of 9% per annum for the next 3 years, and at the rate of 12% per annum for the period beyond 5 years. If he pays a total interest of P 10 625 at the end of 9 years, how much money did he borrow? Answer: P = 9. Find the exact and ordinary interest earned if P 40 000 is invested at 15% simple interest for 200 days. Answer: le = lo = 10. Determine the interest and maturity value of P 70 000 if it is invested a 15% simple interest for 145 days using exact and ordinary interest. Answer: le = F = lo = F =