A jeweler knows that if they price jade rings at $60, they will sell
120 each day. For each decrease of $2, five additional
sales will be made. This means the jeweler's revenue can
be modeled by the formula R = (60 – 2x)(120 + 5x),
where x is the number of $2 decreases. Multiply out the
binomials and use a table of values to determine what
price will give the most revenue.