The Sales Manager of a Department Store Finds That Its

Short Answer

The sales manager of a department store finds that its daily sales begins to fall after the end of a promotional campaign.The sales in dollars as a function of the number of days after the campaign's end is given by S(d)= 36,000
.If she does not want sales to drop below 30,000 per day before starting a new campaign,when should she start a new campaign?