A) 30%
B) 40%
C) 70%
D) 75%
Correct Answer: D
Solution :
\[A\times \frac{30}{100}+\frac{B\times 40}{100}=\frac{B\times 80}{100}\] \[\Rightarrow \] \[A\times 30=B\times 40\] \[\Rightarrow \] \[\frac{A}{B}=\frac{40}{30}=\frac{4}{3}\] \[\Rightarrow \] \[\frac{B}{A}=\frac{3}{4}\] \[\Rightarrow \] \[\frac{B}{A}\times 100=\frac{3}{4}\times 100=75%\]You need to login to perform this action.
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