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Stomata density doubt

Hey guys despite doing many calculations I am still getting the answer for question 3 wrong
So far I found the area of the image in mm (68*94) then I did 1 divided by the area and multiplied it by the no of stomata in the image but my answer is still wrong the answer is A but I don't know how

https://www.ocr.org.uk/Images/471872-question-paper-unit-h420-01-biological-processes.pdf
Original post by Stormragexox
Hey guys despite doing many calculations I am still getting the answer for question 3 wrong
So far I found the area of the image in mm (68*94) then I did 1 divided by the area and multiplied it by the no of stomata in the image but my answer is still wrong the answer is A but I don't know how

https://www.ocr.org.uk/Images/471872-question-paper-unit-h420-01-biological-processes.pdf

Convert your measurements to the actual length

So the actual area of the image = 68/60 x 94/60 = 1.78 mm^2

I count 17 stomata in the image

So stomatal density = 17 / area = 17/ 1.78 = 9.56 stomata /mm^2

so the closest answer to what we have is A
Thank you

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