A wholesaler bought 1,200 radios for Tk. 18 each .The wholesaler sold 60 percent of the radios for Tk. 30 each and the rest for Tk. 15 each . what was the wholesaler's average profit per radio?

Correct Answer: Tk. 6
Cost price = 1200×18 = 21600 Revenue = (60% of 1200)×30 + (40% of 1200)×15 = 21600 + 7200 = 28800 Profit = 28800 - 21600 = 7200 Profit per radio = 7200 / 1200 = 6 TK