Can anyone complete this for a GST return?

Scenario
Penny Wong began a photocopying service in July. She is registered for GST and completes GST returns bi-monthly on a payments basis.
The following transactions took place last July. The figures stated are inclusive of GST if there is any GST.

Investment by owner
$4,500
Received and paid an invoice for one month’s rent
$450
Received an invoice for a copier purchased on credit terms
$2,610
Did a copying job and received
$1,080
Invoiced a customer for
$540
Paid a bill for paper supplies
$90
Paid wages to a part-time employee
$280
Purchased paper supplies on credit
$180
Received part payment of an invoice
$300
Received an invoice for electricity and paid
$90
Made a partial payment on the paper supplies
$70
Withdrew cash from the company bank account
$800

• Total Sales:
• GST on Sales:
• Total Purchases:
• GST on Purchases: