need help thanks

14. interest? How long will it take for P5, 000 to become P6, 500 at 6% simple 15. Accumulate P5, 000 at 9% for 7 years. 16. Find the simple interest of P4, 500 at 6.5% for a. 5 years b. 10 years c. 4 months d. 60 days