想問$25.5,英文應該點寫?口語又應該點講?

Written: Twenty Five dollars and Fifty cents.

Spoken: Be noted that most likely we would omit "and" in our dailylife. During the time I lived in The UK and Singapore, people would simply say "Twenty Five dollars (bugs) fifty cents". If there's no decimal place, then I'd even say "Twenty Five bugs" - but it's quite Am Eng instead.

PS: all the above answers are correct as well.

twenty five dollars and fifty cents
書面語同口語都係一樣咁講~

twenty five dollars and fifty cents

It's the same
twenty five dollar and fifity cents