The grocery store sells beans in bulk. The grocer's sign above the beans says: 5 pounds for $4. Claude needs one pound of beans to make soup. How much money will Claude need? This is a question my son is struggling with and I don’t know how to explain it to him.

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