A sum amounts to ₹ 1326 in 6 years at 5% p.a. simple interest. In what time will this sum double itself at the same rate of interest ?
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Let the sum = P
Amount = Principal + Interest
I = (PRT)/100
A = P + I
1326 = P + (Px5x6)/100
1326 = P + 0.3P
1326 = 1.3P
P = 1326/1.3
= 1020
For the sum to double it will come to 1020x2 = 2040
2040 = 1020 + (1020x5xT)/100
2040-1020 = 51T
1020 = 51T
T = 1020/51
T = 20
The sum will double itself in 20 year
Let the sum = P
Amount = Principal + Interest
I = (PRT)/100
A = P + I
1326 = P + (Px5x6)/100
1326 = P + 0.3P
1326 = 1.3P
P = 1326/1.3
= 1020
For the sum to double it will come to 1020x2 = 2040
2040 = 1020 + (1020x5xT)/100
2040-1020 = 51T
1020 = 51T
T = 1020/51
T = 20
The sum will double itself in 20 year
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