The sales decay for a product is given by S = 80,000e-0.5x, where S is the monthly sales and x is the number of months that have passed since the end of a promotional campaign. (a) What will be the sales 6 months after the end of the campaign? (Round your answer to two decimal places.) (b) How many months after the end of the campaign will sales drop below $1,000, if no new campaign is initiated? (Round up to the nearest whole number.) months