Typically, weekly sales will drop off rather quickly after the end of an advertising campaign. This drop in sales is known as sales decay. Suppose that the gross sales, S, in hundreds of dollars, of a certain product is given by the exponential function Upper S left parenthesis t right parenthesis equals 8000 left parenthesis 2 Superscript negative 0.3 t Baseline right parenthesis where t is the number of weeks after the end of the campaign. Answer the following questions. Question content area bottom Part 1 a) What was the level of sales immediately after the end of the ad campaign when tequals0? Upper S left parenthesis 0 right parenthesisequals 8000 (Round to the nearest whole number as needed.) Part 2 b) What was the level of sales 1 week after the end of the advertising campaign? Upper S left parenthesis 1 right parenthesisequals enter your response here (Round to the nearest whole number as needed.)