Find the simple interest rate of the principal of Php. 15,000 with simple interest of Php. 30,000 for 5 years.

A yearly payment of ₱50,000 is due at the start of each year for 10 years for an insurance worth ₱1,000,000; 20 years from now. What is the interest rate per year compounded monthly, quarterly, semi-annually?

Calculate the simple interest on R2 500 at 3.75% per month for 6 years.

Joanna Mae inherited Php 25,000 on the day she became 19 years old. Under the specifications of the will, the money was placed under a trust fund that earned interest at 15% compounded semiannually. What amount was in the fund on Joanna Mae's 21st birthday?