Below is a general journal entry for payment of the account, Brown's Birthday hire. I have attracted the discount for payment made in under 30 days. how do I record the GST component of the discount?

The answer I just received for the above question says to dr GST paid 2.50 and leave everything else as is but this means my debits and credits are not equal -

dr 550 + dr 2.50 = 552.50 and cr 522.50 + cr 27.50 = 550.00. how to ensure my debits and credits are equal while still recognising the GST component of the discount?

Accounts payable dr 550.00

Bank cr 522.50

Discount received cr 27.50

Narration - Paid invoice #321 in full to Browns Birthday Hire

The answer says to dr Acc/pay 550 and cr Bank 522.5 and cr Disc rec 27.50 and GST paid cr 2.50. It then says this means all my dr and cr are equal. but they are not. That means my dr are 550 and my cr are 552.50. I dont understand the logic here, is it just me? beacause unless I take the 2.50 from either Acc/pay Bank or Disc rec then I dont know how to make the dr and cr equal..