Read the advertisement: 'Gym membership — join before July 31 and get the first month FREE. Standard rate: $40/month.' A person joins on August 1st. How much do they pay for the first month?
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A
$0, because they still get a free month
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B
$20, because they get a 50% discount
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C
$40, because the offer has expired
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D
$80, because they missed the deadline penalty