The Monsanto supply chain team selects a linear forecasting model with $b=6\mathrm{.}9$ and $a=128.$

Calculate the linear forecasted demand for quarters $13$ to $15.$ Then, given the actual demand

for quarters $13$ to $15$ below, compare it with your forecasts. What is the mean absolute

percentage error $($MAPE$)?$ Note: Only the MAPE answer should be entered below as a

percentage $($one place of decimal$).$