Set up an equation to calculate the following (create your own variable names): a. The area of a room. B. The wall area of a room including windows and doors. C. The wall area of a room not including two windows and a door. D. The number of miles given a number of feet. (use 5,280 feet per mile. ) e. The percent increase (or decrease) of a value given the beginning number and the ending number. How would the result differ between increase and decrease? f. The average of five numbers. G. The sale price of an item given an original price and a percentage discount.