A) 20
B) 50
C) 100
D) 200
Correct Answer: A
Solution :
\[\frac{P_{A}^{{}^\circ }-{{P}_{A}}}{P_{A}^{{}^\circ }}=\frac{{{n}_{B}}}{{{n}_{A}}}\] \[\frac{2-1}{2}=\frac{{{W}_{B}}}{{{M}_{B}}}\times \frac{{{M}_{A}}}{{{W}_{A}}}\Rightarrow \frac{1}{2}=\frac{1}{{{M}_{B}}}\times \frac{200}{20}\] \[\Rightarrow {{M}_{B}}=\frac{200\times 2}{20}=20\]
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