Complete the following tasks:

Design a method that calculates the monthly cost to rent a roadside billboard. Variables include the size of the billboard (S, M, or L, for small, medium, or large) and its location (H, M, or L for high-, medium-, or low-traffic areas). The method should throw an exception if the size or location code is invalid. The monthly rental cost is shown in Table 11-1.

	High Traffic	Medium Traffic	Low Traffic
Small size	900.00	500.00	200.00
Medium size	1600.00	1200.00	600.00
Large size	2000.00	1500.00	800.00

            Table 11-1 Monthly billboard rental rates