Aptitude Round Interview Logical Reasoning

A certain sum of money is invested and compounded annually. That sum increases to 4 times, in 4 years. In how many years, the sum increases to 16 times the principle amount?

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Aptitude Round Other Question
Find the 20,000th element of the series 1, 2,2, 3,3,3, 4,4,4,4, .... In a 500m race, A beats B by 25m or 5sec. Find A's speed
(a) 5/19m/s
(b) 44/11 m/s
(c) 3/13m/s
(d) 21/2 m/s