Please use the space provided to solve the question: $($LO$3)$

Year Sales Forecast

$2018,140,000,120,000$

$2019,130,000,116,000$

$2020,150,000,121,600$

$2021,140,000,132,960$

$2022,150,000,135,776$

$2023,165,000,160,500$

a$.$ Compute a four$-$period moving average forecast to estimate the sales in $2024.(5$ pts$.)$

b$.$ Compute a weighted moving average forecast using weights $($ordered starting from the most recent period$)$ of $0\mathrm{.}4,0\mathrm{.}3,0\mathrm{.}25$ and $0\mathrm{.}05$ to estimate the sales in $2024.(10$ pts$.)$

c$.$ Compute an exponential smoothing forecast where $=0\mathrm{.}55$ to estimate the sales in $2024.(10$ pts$.)$

d$.$ Compute a Linear Trend Forecast to estimate the sales in $2024.(15$ pts$.)$