An ice cream truck owner has determined that his maximum revenue occurs when he sells 1{,}2501,2501, comma, 250 cones per month. For every cone above or below 1{,}2501,2501, comma, 250 that he sells, his revenue decreases by \$0.15$0.15dollar sign, 0, point, 15. Which of the following equations can be used to find the possible numbers of cones, ccc, for which the revenue decreases \$250$250dollar sign, 250 from the maximum?