Find the principal which yields a simple interest of Rs. 20 and compound interest of Rs. 28 in two years, at the same percent rate per annum?	Choose the correct choice from the following answers: A) s. 25 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. 28   % rate per annum = [(CI – SI) / (SI in 1 year)] *100   = [(28 – 20) / 20] * 100   = 40 % p.a.   Let the principal be Rs. X   Time = T = 2 years   % rate = 40% p.a.   SI = (PRT/100)   20 = (X*40*2) / 100   X = Rs. 25   s. 25NSWER: s. 25
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Find the principal which yields a simple interest of Rs. 20 and compound interest of Rs. 28 in two years, at the same percent rate per annum?