A) Rs 15
B) Rs 12
C) Rs 10
D) Rs 8
Correct Answer: C
Solution :
Let original rate be \[\text{Rs}\] \[x\] per kg. New are = 80% of \[x=\left( \frac{80}{100}x \right)=\text{Rs}\frac{4x}{5}\] and original quantity for \[\text{R}s\,120=\frac{120}{x}\] new quantity \[=120\times \frac{5}{4x}=\frac{150}{x}\] \[\therefore \] \[\frac{150}{x}-\frac{120}{x}=3\] \[\Rightarrow \] \[\frac{30}{x}=3\] \[\Rightarrow \] \[x=\frac{30}{3}=\text{Rs}\,10\] Hence, original rate is Rs 10 per kg.You need to login to perform this action.
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