1. Zing Cell Phone Company entered into the following transactions involving current liabilities during 2020 and 2021. 2020 Mar. 14 Purchased merchandise on credit from Ferris Inc. for $138,000. The terms were 1/10, n/30 (assume a perpetual inventory system). Apr. 14 Zing paid $24,000 cash and replaced the $114,000 remaining balance of the account payable to Ferris Inc. with a 5%, 60-day note payable. May 21 Borrowed $124,000 from Scotiabank by signing a 4.5%, 90-day note. ? Paid the note to Ferris Inc. at maturity. ? Paid the note to Scotiabank at maturity. Dec. 15 Borrowed $99,000 and signed a 5.25%, 120-day note with National Bank. Dec. 31 Recorded an adjusting entry for the accrual of interest on the note to National Bank. 2021 ? Paid the note to National Bank at maturity.

Required: 1. Determine the maturity dates of the three notes just described.