Read the passage below and solve the questions based on it.
Surya Pratap Singh has 4 children (two daughters who are older to the two sons). He decides to divide his property among his children such that both the daughters together get the same share as the two sons together. Elder son gets more than the younger son and the elder daughter gets more than the younger daughter. His entire property consists of cash, gold coin and copper plate. Each gold coin is worth Rs 5,000 and copper plate in worth Rs 1,000. The eldest daughter got 1/3rd of the gold and 1/5th of the copper while elder son got Rs 1,50,000 in cash, 50% of his wealth as gold and 250 copper plates. The younger daughter got 18% of the copper and 15% of the cash. The younger son got cash equal to 90% of the cash the elder daughter got and 1/6th of the gold and 12% of the copper. Surya Pratap Singh has gold worth 3 times that of copper.
If the younger son wants to sell all the copper he has, who is capable of buying it by paying cash?