Given: Profit of 1 bag of white cement = **₹ **8 And Loss of 1 bag of grey cement = **₹ **5

(a) Profit on selling 3000 bags of white cement = 3000 x 8 =**₹ **24,000

Loss of selling 5000 bags of grey cement = 5000 x 5 = **₹ **25,000

Since Profit < Loss

Therefore, his total loss on selling the grey cement bags = Loss – Profit = 25,000 – 24,000 = ` **₹ **1,000

Thus, he has lost of **₹ **1,000 on selling the grey cement bags.

(b) Let the number of bags of white cement be x. According to question, Loss = Profit

Thus, he must sell 4000 white cement bags to have neither profit nor loss.