The sales in thousands of a new type of product are given by

Last updated: 8/26/2022

The sales in thousands of a new type of product are given by S(t)=180-50 e -0.3t, where t represents time in years. Find the rate of change of sales at the time when t=3. Round to the nearest tenth. A. 6.1 thousand per year B.-36.9 thousand per year C.-6.1 thousand per year D. 36.9 thousand per year