P7-8 (L04) (Notes Receivable Journal Entries) On December 31, 2017, Oakbrook Inc. rendered services to Beghun Corporation at an agreed price of $102,049, accepting $40,000 down and agreeing to accept the balance in four equal installments of $20,000 receivable each December 31 . An assumed interest rate of 11% is imputed. Instructions Prepare the entries that would be recorded by Oakbrook Inc. for the sale and for the receipts and interest on the following dates (prepare an amortization schedule). (Assume that the effective-interest method is used for amortization purposes.) (a) December 31, 2017. (c) December 31, 2019. (e) December 31, 2021. (b) December 31, 2018. (d) December 31, 2020