explanation R$2$ value is $0\mathrm{.}987(98\mathrm{.}7\%).$ This shows that the number is good for sales within this data set.

MSE$=91826\mathrm{.}68$

If the sales in the future years are based on this regression equation, it would show that there would be high based on the past data, but it may not be accurate. This is because of factors that could play a role. These include the linear relationship that is assumed which could be an issue because we aren$$t sure what the future years will look like. It could not be accurate due to any drastic changes that might change in the future years.