9708/12 Economics Feb Mar 2021 Online Test | Cambridge AS and A Level MCQ

The workers in a factory currently earn $240 for a 40-hour week. The management offers them a choice between either a 10 per cent wage increase or an increase in the weekly wage to $260 along with a reduction from 40 to 39 hours.
Disregarding the value of leisure time, what is the opportunity cost to each worker of opting for the 39-hour week?