Amir lent rs 600 to Hamid for 2 years and rs 150 to Aman for 4 years and received from both rs 90 as simple interest. What is the rate of interest

Question

We have to find the rate of interest 

Answer 1

Hamid: 90 = 600*r*2 => r = 90/1200 => r =7.5%

 

Aman: 90 = 150*r*4  => r = 90/600 => r = 15%