Could I get some help with the average cost of these dates?

Calculate the Moving-average cost per unit at January 1,5,8,10,15,16,20, \& 25 . (Round moving-average cost per unit answers to 3 decimal places, eg. 5.251. ) January 1 $Moving-AverageCostperunit January 5514.77 \begin{tabular}{ll} January 8 & 14.77 \\ \hline \end{tabular} \begin{tabular}{ll} January 10 & 14.77 \\ \hline \end{tabular} January 15$ January 16 January 20 January 25 3