A) 30
B) 25
C) 60
D) \[{{a}_{1}}:{{a}_{2}}={{b}_{1}}:{{b}_{2}}\]
Correct Answer: C
Solution :
4th proportion \[C.I.=A-P=P\] Let forth proportion is x \[\left\{ {{\left( 1+\frac{R}{100k} \right)}^{nk}}-1 \right\}\] \[{{R}_{1}}%\] \[{{R}_{2}}%\]
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