the compound interest at 10percent per annum on a sum is rs. 4200 in 2years. Find the sum
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here is your answer OK
If X is the principal,
X* 110/100 X 110/100 = X + 4200
1.21 X = X + 4200
1.21X - X = 4200
.21 X= 4200
X = 4200/ .21 = 20000
Now S I, for 2 years,
X * 2* 10/100 = 4000
If X is the principal,
X* 110/100 X 110/100 = X + 4200
1.21 X = X + 4200
1.21X - X = 4200
.21 X= 4200
X = 4200/ .21 = 20000
Now S I, for 2 years,
X * 2* 10/100 = 4000
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