$3.$ The actual value and forecasted demand for the first month is equal to $750$ and $780,$ respectively. What should be the value of alpha $($using exponential smoothing$),$ if the forecasted value of second month is equal to $768?$ a$.0\mathrm{.}3*$b$.0\mathrm{.}4$

c$.0\mathrm{.}2$ d$.0\mathrm{.}5$