Kenduri Co (6/13)

Dear Sir,

In the question Kenduri Co, part a, at the exercise price $1.62/£. we need to hedge 23.7 contracts then it’s round to 23 contracts.

Question: if the decimal is more than 0.5, i usually round up 1 more contract. In above question, i round to 24 contracts so my result is different from the solution in the book. Why did they round to 23 contracts in this case ? any rule for this?

Thanks,
DT