On October $10,2020,$ Skysong Co$.$ entered into a contract with Belisle Inc. to transfer Skysong's specialty products $($sales value of $$9,100,$ cost of $$6,100)$ on December $15,2020.$ Belisle agrees to make a payment of $$4,900$ upon delivery and signs a promissory note to pay the remaining balance on January $15,2021.$ What entries does Skysong make in $2020$ on this contract? Ignore time value of money considerations. $($Credit account titles are automatically indented when the amount is entered. Do not indent manually. If no entry is required, select $"$No Entry" for the account titles and enter $0$ for the amounts.$)$

Date Account Titles and Explanation

Oct. $10,2020$ No Entry

Dec. $15,2020$ No Entry

$($To record sales$)$