Q7.(20 points) Write a tariff class for a GSM operator that has minutes as integer, textMessages as integer, and mobileData as double as class attributes. When the tariff is purchased 1000 minutes, 500 textMessages, and 10GB data are loaded. The class will have AddMinutes that loads 500 minutes and 100 textMessages as bonus for every 20 TLs, AddData that loads 10 GB for every 50 TLs. Plus, write RemainingBalance to print out remaining usages on the screen. Write a test class that buys the tariff and loads 40 TLs for minutes and 150 TLs for the data and prints out the balance of the tariff