The diameter of a red blood cell in a diagram was measured as 2.5 cm.
The actual diameter of the red blood cell was $7\,\mu m$.
Which calculation would give the correct magnification for the red blood cell in the diagram?
1 )
$\frac{7}{{25000}}$
2 )
$\frac{2500}{{7}}$
$\frac{25000}{{7}}$
4 )
$\frac{25000}{{7000}}$
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