Mary bought maize and beans from a wholesaler. She then mixed the maize and beans ratio 4:3, she bought the maize as $4 per kg and the beans $2 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?
If there are 4x kg of maize and 3x kg of beans, then we have
1.3(4*4/7 + 2*3/7) = $4.09/kg
check:
4kg at $4 = $16
3kg at $2 = $6
4.09*7 = $28.63 = 1.3 * $22