after how many years does a sum of Rs 400 become double at simple interest of 10% per annum
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Step-by-step explanation:
principle = Rs 400
Rate = 10%
S.I = 400×2 = Rs 800
Time = ?
S.I = P × R × T / 100
800 = 400 × 10 × T / 100
800 = 40×T
T = 800/40
T = 20 years
Hope it helps you....
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