BPP Study text – question 65 and 66. Error in one of questions?

Dear Sirs/Madam,

I’m in a stage of studying 10th chapter of BPP study text and I think that there is a mistake in one of 2 questions in practice questions and answer bank.

65th question:
Shelley has trading income and property business income in 2016/17 and in 2017/18 has trading loss.
66th question:
William has also trading income and property business income in 2016/17 and in 2017/18 has trading loss.
in 65th question maximum tax relief is sum of trading income and property business income
but in 66th question max. tax relief is trading income+ (trading income + Property business income)*25%.

is there any mistake? or I don’t understand some parts of this questions and/or rules? please help… totally frustrated.
Please mail me: p.aliyev@inbox.ru