Since the beginning of the year, the purchase manager at a department store has peen recording sales data to be used to compute both weighted and non$-$weighted $4-$period moving averages to forecast sales for an upcoming month. For the veighted moving average, the employed weights are $0\mathrm{.}15,0\mathrm{.}1,0\mathrm{.}2,0\mathrm{.}55.($The lattermost weight is for the immediately preceding month.$)$ Sales data for the months of January through July are reported in the table below.

$\backslash$table$[[$Month$,$Sales$],[$January$,34],[$February$,23],[$March$,25],[$April$,19],[$May$,31],[$June$,28],[$July$,21]]$

Compute the four period moving average forecast for August.

Specify as a number with up to two decimal digits by rounding.

Compute the weighted four period moving average forecast for August.

Specify as a number with up to two decimal digits by rounding.