A sum of money under compound interest doubles itself in 4 years. In how many years will it become 16 times itself?
12 years
16 years
8 years
None of these
16 years
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A certain loan amounts, under compound interest, compounded annually earns an interest of Rs.1980 in the second year and Rs.2178 in the third year. How much interest did it earn in the first year?
Rs.1600
Rs.1800
Rs.1900
None of these
xyz pqr abc year tt
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