1 12. A sum of money amounted to # 2040 in 2 years at 11% per annum. Find the sum.
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Answer:
Let the principal = Rs. x
S.I = Rs.
100
x× 2
11×5 = Rs.
40
11x
Amount =P+S.I.= 1x+ 40
11x = 40
40x×11x
= 4051x
But 4051x
=2040
⇒51x=2040×40.
⇒x=
40×51
2040
= Rs. 1600
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