math
posted by sarah .
as a regular customer in my favourite restaurant,i get 10%discount.but to the cost of the meal must be +17.5%gstand 12%service charge.if the %are to be worked out in turn(which each%addition or discountbeing on the previous answer),which order of working leaves me the least to pay?1)gst,service,discount 2)service,gst.discount 3)discount,gst,service 4)discount,service,gst

math 
Reiny
cost = (.9)(1.175)(1.12) x
I will get the same result no matter how the multiplication factors are arranged.
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