Kola took #5 to the market to do some shopping for his mother. He bought 21/2kg of meat at #1.50 per kg., 40k worth of melon, and #50 kobo worth of vegetable. How much money had he left?

The total cost of the meat is 2.5 * 1.50 = #3.75

Adding the cost of the melon and vegetable, the total amount spent is 3.75 + 40 + 0.50 = #44.25
Kola started with #50, so he had #50 - #44.25 = #5.75 left.

Therefore, Kola had #5.75 left after shopping.