Find the principal which yields a simple interest of Rs. 20 and compound interest of Rs. 24 in two years, at the same percent rate per annum? Choose the correct choice from the following: A) s. 50 B) s. 48 C) s. 42 D) s. 20 E) s. 60
Explanation:   SI in 2 years = Rs. 20, SI in 1 year = Rs. 10   CI in 2 years = Rs. 24   % rate per annum = [(CI – SI) / (SI in 1 year)] *100   = [(24 – 20) / 20] * 100   = 20 % p.a.   Let the principal be Rs. X   Time = T = 2 years   % rate = 20% p.a.   SI = (PRT/100)   20 = (X*20*2) / 100   X = Rs. 50   s. 50NSWER: s. 50
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Find the principal which yields a simple interest of Rs. 20 and compound interest of Rs. 24 in two years, at the same percent rate per annum?