A) Rs. 15
B) Rs. 12
C) Rs. 10
D) Rs. 8
Correct Answer: C
Solution :
| [c] Let the original price be Rs. x per kg. Reduced price = Rs. (80% of x) \[=\text{Rs}.\left( \frac{80}{100}\times x \right)=\text{Rs}.\frac{4x}{5}\text{per}\,\,kg\] \[\frac{120}{\left( \frac{4x}{5} \right)}-\frac{120}{x}=3\] \[\Rightarrow \] \[\frac{120\times 5}{4x}-\frac{120}{x}=3\] \[\Rightarrow \] \[\frac{150}{x}-\frac{120}{x}=3\] \[\Rightarrow \] \[3x=(150-120)=30\] \[\Rightarrow \] \[x=10\] Original price = Rs. 10 per kg |
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