First you must find out what the initial payment would have been, My way of doing it was simply multiplying 37 by 11.5 I then get 425.5, then to find out the amount for the .5 (half hour)simply divide 11.5,the answer is then £5.75,....now we add £425.5 + £5.75= £431.25 Now... we need to deduct her “deductions” lol which was £116.30 so £431.25-£116.30=£314.95 So her payment was £314.95