This activity is based on Exercises $2\mathrm{.}54$ to $2\mathrm{.}56,$ with some modifications.

Our example concerns a class called Budget, and an incomplete version of this class is provided below. This class provides methods relating to costs of items and whether we can afford them.

Some methods have empty bodies that need to be completed as follows:

Complete the method called setTotalCost, which finds the product of the parameters called unitPrice and quantity and stores the result in the field called totalCost.

Complete the method called setMeanCost. The method divides the parameter totalCost by the parameter units, and stores the result in the field meanCost.

Complete the method called printAffordability. The method uses an if$-$statement to compare the value of the parameter price with the field called budget. If price is greater than budget then the method prints

Too expensive

otherwise it prints

Within budget