Q. In how many years will a principal sum get doubled at 10% rate of simple interest per annum?

8 years

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10 years

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5 years

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None of these

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Solution

The correct option is B 10 years
$A m o u n t (A) = P r i n c i p a l (P) + I n t e r e s t (S I)$

$2 P = P + P T R / 100 \to 2 P - P = P T 10 / 100$

$P = P T / 10 \to 1 = T / 10 \to T = 10 y e a r s$

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