The forecasts generated by two forecasting methods and actual sales are as follows:

Month Sales Forecast $1$ Forecast $2$

$1269275268$

$2289266287$

$3294290292$

$4278284298$

$5268270274$

$6269268270$

$7260261259$

$8275271275$

a$.$ Compute the MSE, the MAD, and the MAPE, $($for the $8$th period$)$ for both forecasting methods $.($You will have $6$ answers MSE$1.$ MSE$2,$ MAD$1,$MAD$2,$ MAPE$1$ and MAPE$2)$ Show your work