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A 10% B 20% D 15%
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Let the rate is R% p.a.
[18000(1+R100)2−18000]−[18000×R×2100]=405
$18000[(100+\frac{({R}{^2}{10000})-1-(\frac{2R}{100})]=40518000[(100+R)^2-10000-200R]=405\frac{9 R^2}{5}=405R^2=\frac{405\times 5}{9}=225R=15$
Rate of interest=15%
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