A seller purchases the green colour of HOLI from two dealers, 5 kg. from a dealer at a rate of 60 rupee per kg.
and 7 kg. from other dealer at a rate of 80 rupee per kg.
If he sells the colour after mixing, then its selling rate for getting a profit of 20 % will be
Cost of 5 kg. green colour of HOLI is 60*5 = 300
Cost of 7 kg. green colour of HOLI is 80*7 = 560
Total cost of 12 kg. green colour of HOLI is 300 + 560 = 860
For getting 20 % profit, seller has to receive 860 * 1.2 = 1032 rupee
Hence cost of the colour is 1032/12 = 86