A) Rs. 15
B) Rs. 12
C) Rs. 10
D) Rs. 8
Correct Answer: C
Solution :
Let original rate \[=Rs.\,x\,\text{per }kg\] New rate\[=80%\,\,of\,\,x=Rs.\left( \frac{80}{100}x \right)\] \[=Rs.\frac{4x}{5}\] Original quantity for \[Rs.\,120=\frac{120}{x}\] New quantity\[=120\times \frac{5}{4x}=\frac{150}{x}\] \[\therefore \] \[\frac{150}{x}=\frac{120}{x}=3\] \[\Rightarrow \] \[\frac{30}{x}=3\,\,\,\Rightarrow \,\,x=\frac{30}{3}=10\] \[\therefore \] Original rate \[=Rs.\,10\,\text{per }kg\]
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