Can somebody please tell me how to work this on Access. Thank you

1. Create a calculated field in the first empty field named DaysOnMarket that will calculate the number of days each sold property was on the market when it sold. Add a caption of Days on Market.

2.Create another calculated field in the first empty field named ListComm that will calculate the listing agent's commission based on the sales price and a listing commission rate of 3.5%. Add a caption of Listing Commission and format the field as Currency.

3.Create another calculated field in the first empty field named SellComm that will calculate the listing agent's commission based on the sales price and a selling commission rate of 2.5%. Add a caption of Selling Commission and format the field as Currency.