Define the following methods for the class Ledger, as described in the previous exercise:

• getAverageSale()—returns the average value of all the sales
• getCountAbove(v)—returns the number of sales that exceeded v in value

Previous exercise:

Create a class Ledger that will record the sales for a store. It will have the attributes 

• sale—an array of double values that are the amounts of all sales 
• salesMade—the number of sales so far 
• maxSales—the maximum number of sales that can be recorded 

and the following methods:

Ledger(max)—a constructor that sets the maximum number of sales to max

• addSale(d)—adds a sale whose value is d
• getNumberOfSales—returns the number of sales made
• getTotalSales—returns the total value of the sales