A) Rs. 20 per kg
B) Rs. 22.50 per kg
C) Rs. 25 per kg
D) Rs. 27.50 per kg
Correct Answer: D
Solution :
| [d] Let the original price be Rs. x per kg New price per kg \[=\text{Rs}.\left( \frac{80}{100}\times x \right)\] \[=\text{Rs}.\frac{4x}{5}\] \[\frac{385}{\frac{4x}{5}}-\frac{385}{x}=3.5\] \[\Rightarrow \] \[\frac{1925}{4x}-\frac{385}{x}=\frac{7}{2}\] \[\Rightarrow \] \[(1925-1540)=14x\] \[\Rightarrow \] \[14x=385\] \[\Rightarrow \] \[2x=55\] \[\Rightarrow \] \[x=\frac{55}{2}=27.50\] Hence, the original price of the rice is Rs. 27.50 per kg. |
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