The person's wage when they worked 9 hours overtime is £284.
The hours worked overtime when wage is £300 is 11 hours.
Wage = basic pay + (number of hours overtime x pay per hour)
£140 + (9 x £16)
£140 + £144
= £284
Hours worked overtime = (wage - basic pay) / pay per hour of overtime
(£300 - £124) / £16
£176 / £16
£11
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