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Answer: C Series I: 5 + (1 + 12) = 7 7 + (2 + 23) = 17 17 + (3 + 32) = 29 29 + (4 + 43) = 97 97 + (5 + 52) = 127 127 + (6 + 63) = 349 Series II: 95 + (1 + 12) = 97 97 + (2 + 23) = 107 107 + (3 + 32) = 119 119 + (4 + 43) = 187
A sum of money doubles itself in 8 years at simple interest. In how many years will it become four times itself at the same rate of interest?