Answer:
Sure, if the bottles are on sale for 5 bottles for $27.00 and you only need three bottles, you can use a $20 bill to pay for them.
To do this, you can place the $20 bill on the counter and inform the cashier that you only need three bottles. They will then calculate the cost of three bottles based on the sale price. If each bottle costs $27.00 for five bottles, then the cost of three bottles would be:
(3/5) * $27.00 = $16.20
Since you have a $20 bill, you can give the cashier the $20 bill and receive $3.80 in change.
Explanation: