Uncle eddie sells bikes and skateboards in his shop there are a total of 12 items in uncle eddies bike shop. there are a total of 40 wheels. how many of each item are in his shop?

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