A dealer earns a profit of Rs.8 per bag of white cement and a loss of Rs.5
per bag of grey cement sold.
i) The company sells 3000 bags of white cement and 5000 bags of grey
cement in a month. What is its profit or loss?
ii) Find the number of white cement bags it must sell to have neither profit
nor loss, if the number of grey bags sold is 6400 bags.