At what rate percent per annum compound interest will rupees 12000 amount to rupees 15972 in 18 months if the interest compounded
semi annually
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A=P[1+R/200]^2N
15972=12000[1+R/200]^3
15972/12000=[1+R/200]^3
1331/1000(BY REDUCING IN LOWEST FORM)=[1+R/200]^3
[11/10]^3=[1+R/200]^3
11/10=1+R/200(BY CANCELLING POWERS)
11/10-1=R/200
1/10=R/200
10R=200
R=20%
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