This is intro to computer science homework. I sent pics of the instructions and the excel document. I dont get step d at all. It says to calcluate the number of days each hosue was on the market with an equation? I'm completely lost. and it doesn't even say how long the houses were on the market because most of the columns say ####

I dont get all of it. Any other help would be great thanks!! It's due tonight

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J. Heaton Realty Sales Report 2 Days on Market Date Listed Date Sold List Price Sold Price of List Price 4 Prop ID 5 Pr 125 Amsterdam Drive 341 North Oak Drive 100 South 325 West 386 East Elm Street 2304 West 39th Street 41 Chestnut Circle 973 East Mulberry Lane 538 North Oak Drive 64 Chancellor Estates 9 10 0750 10/4/2017 1/5/2018 475000 40000o 12 13 14