On May 1, 2020, Cullumber Inc. entered into a contract to deliver one of its specialty mowers to kickapoo Landscaping Co. The contract requires Kickapoo to pay the contract price of $889 in advance on May 15, 2020. Kickapoo pays Cullumber on May 15, 2020, and Cullumber delivers the mower (with cost of $542) on May 31, 2020. (a) Prepare the journal entry on May 1, 2020, for Cullumber. (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 for the amounts.) Date Account Titles and Explanation Debit Credit May 1, 2020 (b) Prepare the journal entry on May 15, 2020, for Cullumber. (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 for the amounts.) Date Account Titles and Explanation Debit Credit May 15, 2020 (c) Prepare the journal entry on May 31, 2020, for Cullumber. (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 for the amounts.) Date Account Titles and Explanation Debit Credit May 31, 2020 (To record sales)