First convert the ratio to percentage
Percentage strength =100/ratio strength
=100/4000
=0.025%
This refers to 0.025gm in 100gm
So to calculate in 10 g
Cross multiply and divide
=0.025×10÷100
=0.0025gm
Convert g to mg multiply gram by 1000
=2.5mg
An:2.5 mg of iodine to be used
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