Answer: 10.53%
Step-by-step explanation:
George £89400 @ 9% = £8046 so income = £89400+£8046=£97446
Harris (Paris?) gets £447 more so 97446+447=£97893
and this represents sales of £89400 plus commission
so Harris' commission = £97893-£89400 = £8493
So last stage is what commission percentage is £8493 of original sales £89400 = 10.53%