(b) 10 %
Explanation
Principal (P) = x
Amount (A) = 2x
Simple Interest (I) = 2x – x = x
Simple Interest (I) = \frac{\text{P × r × t}}{100}
or, x = \frac{\text{x × r ×10}}{100}
or, r = \frac{\text{x ×100}}{x × 10} = 10 %
(b) 10 %
Explanation
Principal (P) = x
Amount (A) = 2x
Simple Interest (I) = 2x – x = x
Simple Interest (I) = \frac{\text{P × r × t}}{100}
or, x = \frac{\text{x × r ×10}}{100}
or, r = \frac{\text{x ×100}}{x × 10} = 10 %
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