To determine the cost of one sip of wine, we first calculate the cost of wine per unit volume. For this case, we need to convert the volume to milliliter for simplicity. We calculate the cost per volume as follows:
cost per volume = $ 278 / 24.5 fl oz ( 1 fl oz / 29.57 mL )
cost per volume = $0.38 / mL
To determine the cost of one sip, we multiply the volume of one sip to the cost per volume.
cost of one sip = $0.38/mL ( 2.0 mL ) = $0.77