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Answer : 1 Rs. 2000 Explanation : Answer: A) Rs. 2000 Explanation: Given, Compound rate, R = 10% per annumTime = 2 yearsC.I = Rs. 420Let P be the required principal.A = (P C.I)Amount, A = P1   r100n(P C.I) = P1   101002(P 420) = P[11/10][11/10]P-1.21P = -4200.21P = 420Hence, P = 420/0.21 = Rs. 2000

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