Answer:
1) February 1, 2019, service revenue
Dr Notes receivable 135,000
Cr Service revenue 135,000
2) if the note is collected on December 1, 2019, the amount of interest revenue = $135,000 x 7% x 10/12 months = $7,875
3) December 1, 2019, cash collected
Dr Cash 142,875
Cr Notes receivable 135,000
Cr Interest revenue 7,875