Ron spent 3/4 hourron spent 3/4 hour drawing his assignment while unspent 1/2 hour how much more time then run spend studying than an ​

There are a total sales of 2,000 dollars on monday on tuesday sales dropped 10% on wednesday sales dropped another 20% compared with tuesday from wednesday to thursday sales increases by an equal amount to 25% of monday total sales what is the net change in dollars on total sales from monday to tuesday