Answer:
 £53,205
Step-by-step explanation:
Megan paid ...
 0 on the first £11,000
 .20 of the next £43,000 -11,000 = £6400
 .40 of the next £150,000 -43,000 = £42,800
 .45 of the next £158,900 -150,000 = £4,005
So, her total tax bill is ...
 £6,400 +42,800 +4,0005 = £53,205
Megan paid a total of £53,205 in tax.