$2.$ A retailer did a frequency analysis of customer behavior with the following result:

Not Return Return Total

Non$-$Defective $400200600$

Defective $10240250$

The retailer noticed that a high percentage of defective products were returned, so he put in place a policy to sell all returned products at a $30\%$ discount. Two years later he went out of business, chiefly as a result of this policy. How should his frequency analysis have been structured? Why? write answer in $2$ senetcnes