Answer:
march: zero
april: 2,460
Step-by-step explanation:
Because Chester used accrual accounting, it will recognize the income when it is earned. Not before.
During March no unit was delivered, so no revenues is recognized
During April it delivers 164 units x 15 = $2,460 accrued revenue
unearned revenue 2,460 debit (it was previously collected)
earned revenue 2,460 credit