How often do you update your exchange rates for non USD currency

I wanted to buy an item which was $40 USD but when added to my cart it became $70 in AUD.

So I checked current exchange rate which is $1 USD which currently equals $1.60 AUD.

So I multiply $40 by 1.6 and it gives me $64 not $70.

Now I realise it’s a small amount but does it really cost the equivalent of $6 AUD for me to buy and download on this website.

Anyone who sees this should check exchange rate on XE Currency.

There probably is some taxes/VAT added to that. The US$ based prices displayed on FAB don’t have any VAT or taxes

I believe it 10% VAT so 64*1.1 = 70