Doubt from strength of H2O2

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According to my understanding of NCERT, none of the options seems correct, and answer is coming as 33.6 g/L

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Look at the higlighted text and comment where I am wrong

Find number of moles of H2O2 which gives that much amount of volume of O2.
Then find the weight and as volume strength is measured from 1 L soln you get concentration.

Pls share you soln so that we can find mistake .

Isn't there should be linear relation between strength and volume according to ncert
30% is marked as 100v
And according to solution of question
3% is marked as 10v

Than 11.2v should be 3.36% or 33.6g/L

Why I am incorrect?

Can anyone see?

Doubt is solved