FORECASTING COMPUTATION PROBLEM

A business has the following weekly demand figures: Week $1$ demand is $20$; Week $2$ demand is $50$ ; Week $3$ demand is $40$ ; Week $4$ demand is $20$ ; Week $5$ demand is $30.$ Using a four week moving average, what is your forecast for week $6?$

$1)24$

$32$

$32\mathrm{.}5$

$35$