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 = %

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FormerPadresfan · 26-30, M

.04x5= .20
.87-.2= .67
67%

summerlove · 31-35, F

@FormerPadresfan I'm doing online practice quizzes and the answer said 70%. I'm so lost.

FormerPadresfan · 26-30, M

@summerlove Maybe...
1-.04= .96
.87x.96x.96x.96x.96x.96

Try entering that second part into a calculator

summerlove · 31-35, F

@FormerPadresfan Yes you are correct. I don't know how you worked it out though haha.