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Answer:
Here goes the solution,
10. Let the P is the principle sum of money and R is rate of interest.
SInce,
A = 1.44×P, T = 2 years
So, A = P( 1+R/100)^T
1.44P = P( 1+R/100)^2
( 1+R/100)^2 = 1.44
1+R/100 = 1.2
R/100 = 0.2
R = 20%
11. Given: P = Rs 4,000, C.I. = Rs 1,324 and n= 3 years
Now, A = P + I
A = Rs.(4,000+1,324) = Rs.5,324
5324 = 4000(1+R/100)^3
5324/4000 = (1+R/100)^3
1331/1000 = (1+R/100)^3
(1+R/100)^3-1331/1000-(11/10)^3 (1+R/100)= 11/10
R/100 = 11/10-1 = 1/10
R = 100/100 = 10%