Question

) A company has learned that when it initiates a new sales campaign, the number of sales per day increases. However, the number of extra daily sales per day decreases as the impact of the campaign wears of for specific campaign the company has determined that as a result of the campaign, the extra daily sales S(t) = 1000(3^t/2) as t days elapsed since the campaign ended. Find the rate at which the extra daily sales are decreasing when a.) t=4 and b.) t=10