please dont solve if you are not 100% sure, i will downvote if answer is wrong

-. A distributor of refrigerators has average monthly sales of 1,200 refrigerators, each selling for 18,000. From the past experience, the distributor knows that special month-long promotion will enable them to sell 150 additional refrigerators for each * 1,000 decrease in price. What price should be charged for each refrigerator, during the month of promotion, in order to maximize revenue