A school typically sells 500 yearbookseach year for $50 each.The econmics class does a project and discovers that they can sell 100 more yearbooksfor every $5 decrease in price.The revenue for yearbooks is equalto the number of yearbooks sold times the price of the year book. Let x represent the number of $5 decreases in price. If the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). find the valuesof a and
b.