how to calculate GST in calc

hello all this is my first post
so recently ive been tasked to create a invoice template for a new company and ive downloaded this template from and im trying to replace the Discount % section with GST so we can automatically add the GST to the customers bill.
my question is what should i put in place of sections f33 and f34 to add a percent from the line total?

In F33 put the GST percentage rate, e.g. for Australia 10 (percent). Simply change F35 to


So you add the amount as GST rather than subtracting a discount.

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