Sales Forecast using Weighted Moving Average

$1.$ Given the following, determine the expected sales on September $18$th and September $19$th$,$ using a $3-$day weighted moving average.

$2.$ Is your weighted moving average result higher or lower than if you had simply done a $3-$day moving average? What caused it to be higher or lower?

MONTH DATE ACTUAL SALES IN DOLLARS

W$1=10$

W$2=25$

W$3=30$

SEPTEMBER $12$ $$1,500$

$13$ $$2,500$

$14$ $$2,500$

$15$ $$3,500$

$16$ $$3,000$

$17$ $$4,500$

$18?$

$19?$