i don't know how to do the last one

Hal%203%20Exercises%202020%20SM2.pdf T DAT W T your 4. (E 3.10) This is a partial adjusted trial balance of Darcy Designs Pty Ltd. Credit Debit $ 1500 DARCY DESIGNS PTY LTD Adjusted Trial Balance (partial) as at 31 July 2016 No. Account name 110 Supplies 112 Prepaid Insurance 212 Salaries Payable 213 Service Revenue Received in Advance 400 Service Revenue 500 Salaries Expense 505 Supplies Expense 515 Insurance Expense - 2400 $1500 1 125 3 000 7300 1220 800 Required Answer these questions, assuming the year begins on 1 July: (a) If the amount in Supplies Expense is the 31 July adjusting entry, and $1320 of supplies was purchased in July, what was the balance in Supplies on 1 July? (b) If the amount in Insurance Expense is the July adjusting entry, and the original insurance premium was for 1 year, what was the total premium and when was the policy purchased? (c) If $7500 of salaries was paid in July, what was the balance in Salaries Payable at 30 June 2016? (d) There were no additional amounts of revenue received in advance during July. An amount of $2400 was received for services performed in July. What was the amount of Service Revenue Received in Advance at 1 July 2016/30 June 2016? these questions.)