How do you work out this numeracy question?

A Year 10 English essay was due to be submitted on 17th July, with a late submission penalty of 4% per day.

The English teacher gave Daisy's essay a mark of 87%. However the essay was handed in 5 days late.

What will Daisy's final mark be for her essay? Give the mark as a whole percentage.

Daisy's mark = %