the following past demand data and using the weights: $\mathrm{.}5,\mathrm{.}3,$ and $.2($largest weight is for the most recent data$)?$

Month

Demand

Forecast

January $,40$

February $,45$

March

$57$

April

$60$

May

$75$

June

$87$

$50\mathrm{.}00$