(b) In the case of an employee employed on a monthly or weekly rate of pay who works on a rest day, he shall be paid for any period of work— (i) which does not exceed half his normal hours of work, wages equivalent to half the ordinary rate of pay for work done on that day; or (ii) which is more than half but which does not exceed his normal hours of work, one day’s wages at the ordinary rate of pay for work done on that day.