if a sum doubles itself in 8 and 1/3 years find the rate percent per year
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Principal (p) = x
Amount (a) = 2x
S.I. = (p-a) = x
Time (t) = 8 1/3 yrs = 25/3 yrs
Rate = S.I. × 100 / p × t
= x × 100 × 3 / x × 25
= 4 × 3 % = 12% p.a.
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