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total sale price 160k
so luxury tax is 60k*20%=12k
In BC, the PST rate for over 150k is 20%, so PST is (160k-125k)*20%=7k
GST is calculated on luxury tax and PST.
(160k-125k+12k+7k)*5%=2.7k
I think you forgot the 7% PST on the initial 125k as well.