These have risen to $4 per hour/$14 per day

(previously $3 per hour/$12 per day).
Excluding GST, the previous hourly rate of $2.73 might have been raised by say, 10% to cover the cost of living, raising the hourly rate from $2.73 to $3.00, then adding the GST makes the hourly rate $3.30. One has to wonder about the difference between $3.30 and $4.00 and who in Council is getting it.
Should you feel aggrieved by the increase, you should let Council know.....I'm sure they'd agree and lower the rate to something more respectable.