A business employs machine operators. Each machine operator works 36 hours a week.
One unit of output takes four hours of labour.
It also employs supervisors who can each supervise ten machine operators.
Production is currently 1140 units a week.
How many more units can be produced each week before the company needs to employ an extra supervisor?
1 )
3
30
3 )
75
4 )
90
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