from 1574 to 1381 the difference is 193.
now, if we take 1574 to be the 100%, what is 193 off of it in percentage?
[tex] \bf \begin{array}{ccll}
amount&\%\\
\cline{1-2}
1574&100\\
193&x
\end{array}\implies \cfrac{1574}{193}=\cfrac{100}{x}\implies x=\cfrac{193\cdot 100}{1574}
\\\\\\
x\approx 12.261753494~\hspace{7em}\stackrel{rounded~up}{12.3} [/tex]
