Q22 of 32 Page 46

What is the rate of simple interest per annum, when the interest of some money in 4 yrs. will be part of its principal-le us determine it.

Say, rate of simple interest per annum is ‘r’


Interest in 4 years will be =


Let’s say Principal be ‘P’


⇒ Interest =


P = P, r = r, t = 4 and I =


As we know,




⇒ r = 8%


Hence, rate of simple interest will be 8%.


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