A cement company earns a profit of rs.8 per bag of white cement sold and a loss of rs.5 per bag of grey cement sold

A.The company sells 3000 bags of white cement and 5000 bags of grey cement in a month.what is the profit or loss?

B.What is the number of white cement bags it must sell to have neither profit nor loss if the number of grey cement bags sold is 6400 bags