The sales decay for a product is given by

S = 20,000e^0.8x,

where S is the monthly sales and x is the number of months that have passed since the end of a promotional campaign. (Round your answers to two decimal places.)

(a) What will be the sales 5 months after the end of the campaign? $ (b) How many months after the end of the campaign will sales drop below 1000, if no new campaign is initiated? months