Due to fall of 10% in the rate of sugar, 500 gm more sugar can be purchased for Rs. 140. Find the original rate?

Answer: Option A

Money spent originally = Rs. 140
Less Money to be spent now
= 10% of 140
= Rs. 14
Rs. 14 now yield 500 gm sugar
So, Present rate of sugar = Rs. 28 per kg.
If the present value is Rs. 90, the original value = Rs. 100
If the present value is Rs. 28 the original value
$$=\text{Rs}\text{. }\frac{100}{90}\times 28=\text{Rs}\text{. }31.11$$