Set up an equation that can be used to solve the problem. Solve the equation and determine the desired value. At a boating and sports store, the cost of renting a personal watercraft is $47.70 per half hour, which includes a 6% sales tax. Determine the cost of a half hour rental before tax. The equation is The cost of a half hour rental is $ 45 per half hour. (Type an equation using x as the variable.)