Math question from PTCB practice test

For an Iv solution to be isotonic, it must have a similar concentration of sodium chloride found in normal body cells. which of the following concentrations is isotonic?

0.009% NACl
9.000% NaCl
0.900% NaCl
0.090% NaCl

Can someone explain this to me and how you get the answer?

Thanks!

Comments for Math question from PTCB practice test

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ISOTONIC
by: Anonymous

0.90%

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