If Mathew wants to earn a simple interest of ₹ 500 by lending money to his friend at an interest of 10% per annum for 5 years, then the money that he has to lend will be
₹1000
We know that S.I. = PRT100
where, S.I. is the simple interest, P is the principal, R is the rate of interest per annum and T is the time(number of years).
Given S.I. = ₹ 500, R = 10%, T = 5 years
Then by using the above formula, we get,
P=S.I.×100T×R=500×1005×10=₹ 1000.