Cable Television Advertising Was Started August 1 to Increase Visibility

Short Answer

Cable television advertising was started August 1 to increase visibility of the company's product. Sales (in units) for the months before and after the cable television advertising are as follows: $$\begin{array} { l l l l } \text { Before } & &{ \text { After } } \\\hline \text { January } & 2,400 & \text { April } & 2,480 \\\text { February } & 2,520 & \text { May } & 2,870 \\\text { March } & 2,370 & \text { June } & 2,960\end{array}$$ Use the means of each table to calculate the % increase in sales attributable to cable television advertising. (Round to the nearest tenth of a percent)