Need help on this question, Australia tax law for 2019/20

Jack Ramjet owns a clothing store in Melbourne. The following transactions occurred in the September 2019 quarter:

All applicable transactions include GST.

Cash sales $ 65000 Credit sales (accounts receivable customers) $ 120000 Collections of accounts receivables $ 90000 Cash purchases $ 50000 Credit purchases (accounts payable customers) $ 55000 Payment of accounts payables $ 68000 Wages paid to employees $ 24000 Interest received $ 200 Interest paid $ 1200

Calculate the GST payable for the September quarter:

Cash Basis:

Accrual Basis: