1/4 divided by 1/16 is the same thing as 1/4 times 16/1 so that would multiple to 16/4 which is 4.
8% equals 3.2. If you add $40 plus $3.2 cents that shopper would of paid $43.2 cents.
Answer:
here i hope this help im not sure if a can find the exact answer your looking for but here is a formula