42. How many percent was the price raised?

$$\begin{array}{lcl} On\;a\;sale\;a\;sweater\;is\;discounted\;20\%.\\ The\;original\;price\;was\;\$100.\;Then\;the\;price\;is\\ raised\;to\;\$120.\\ How\;many\;percent\;was\;the\;price\;raised?\\ (From\;the\;discounted\;price\;to\;the\;new\;price.)\\ \\ (F)\; 25\%\\ (G)\; 30\%\\ (H)\; 40\%\\ (J)\; 50\%\\ (K)\; 60\%\\ \end{array}$$