A) \[\frac{a-s}{s}\]
B) \[\frac{s-a}{s}\]
C) \[\frac{a}{1-s}\]
D) \[\frac{s-a}{a}\]
Correct Answer: B
Solution :
\[s=\frac{a}{1-r}\] Þ \[s-sr=a\] Þ \[-sr=a-s\] Þ \[r=\frac{s-a}{s}\].
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