Pls help hurts my brain

40% of 70% may seem difficult, but parsing the expression's different parts is essential to being able to understand this

"Of" is an indicator of multiplication. Knowing this, the expressions changes to \(40\%*70\%\).

40%*70%=0.28=28%

Don't get confused by the idea of   'per cent   X   another per cent'   which I think is bothering you. 'Per Cent' just means

'hundredth'.

So 40 per cent   X  70 per cent  is just   40 hundredths    X    70 hundredths.

Which is   40/100   X   70/100

Which is 4/10   X  7/10   =28/100     which is 28  hundredths   which is 28%. 

What is %40 of %70

\(\begin{array}{|rcll|} \hline \%40 \text{ of } \%70 \\ &=& 40\ \% \times \ 70\% \\ &=& 40\times \ 70\ \% \% \\ &=& 2800\ \% \% \\ &=& 28\times 100\ \% \% \quad | \quad 100\ \% = 1 \\ &=& 28\times 1 \% \\ &=& 28\ \% \\ \hline \end{array} \)