Sharon's share for lunch is $8. If she pays with a $20 bill, how much change should she get?

20-8 = ?

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To find out how much change Sharon should get, you need to subtract the cost of lunch from the amount she pays. In this case, Sharon's share for lunch is $8, and she pays with a $20 bill.

To calculate the change, subtract $8 from $20:

$20 - $8 = $12

Therefore, Sharon should get $12 in change.