Fresh grapes contain 90% by weight while dried grapes contain 20% water by weight. What is the weight of dry grapes available from 10 kg of fresh grapes? Choose the correct choice.
A) 2 kg B) 2.4 kg C) 2.5 kg D) 1.250 kg E) none of these

Rationale: "the weight of non - water in 10 kg of fresh grapes ( which is 100 - 90 = 10 % of whole weight ) will be the same as the weight of non - water in x kg of dried grapes ( which is 100 - 20 = 80 % of whole weight ) , so 10 â ˆ — 0.1 = x â ˆ — 0.8 - - > x = 1.25 answer : d"
Answer: D