Find the principal which yields a simple interest of Rs. 20 and compound interest of Rs. 25 in two years, at the same percent rate per annum?	Choose the correct choice from the following answers:
A) s. 40	B) s. 48	C) s. 49	D) s. 20	E) s. 60
Explanation:   SI in 2 years = Rs. 20, SI in 1 year = Rs. 10   CI in 2 years = Rs. 25   % rate per annum = [(CI – SI) / (SI in 1 year)] *100   = [(25 – 20) / 20] * 100   = 25 % p.a.   Let the principal be Rs. X   Time = T = 2 years   % rate = 25% p.a.   SI = (PRT/100)   20 = (X*25*2) / 100   X = Rs. 40   s. 40NSWER: s. 40
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Find the principal which yields a simple interest of Rs. 20 and compound interest of Rs. 25 in two years, at the same percent rate per annum?