Simple Interest = Principal × Rate × Time (in years)
Rate of Interest = [ Interest Amount ÷ (Principal × Time)] x 100
First, convert the rate (in percent) to decimals, by moving the decimal point two places to the left.
The amounts of interest are:
1) Php 1,125.00
2) Php 525.00
3) Php 810.00
Please click image below to view the solution, and the table of values.