well, the difference is just 6300 - 5600 = 700.
if we take 5600 to be the 100%, what is 700 off of it in percentage?
[tex]\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} 5600&100\\ 700&x \end{array}\implies \cfrac{5600}{700}=\cfrac{100}{x}\implies 8=\cfrac{100}{x} \\\\\\ 8x=100\implies x=\cfrac{100}{8}\implies x=\cfrac{25}{2}\implies x=12.5[/tex]
