a man bought 12 oranges for 22.8 naira and sells 4 for 10 naira.what is the cost price in the question

The cost price of one orange can be found by dividing the total cost by the number of oranges purchased:

Cost per orange = 22.8 ÷ 12 = 1.9 naira

To find the selling price of one orange, we need to divide the price per 4 oranges by 4:

Selling price per orange = 10 ÷ 4 = 2.5 naira

Therefore, the cost price in the question is 1.9 naira.