[tex]\boxed{\begin{array}{l}\sf seja~x~a~mercadoria.\\\sf ap\acute os~aumento~de~20\%~temos:1,2x.\\\sf ap\acute os~mais~um~aumento~de~20\%\\\sf temos1,2x\cdot1,2=1,44x.\\\sf isso~representa~um~\acute unico~aumento~de\\\sf \dfrac{1,44x-x}{x}\cdot100=\dfrac{0,44\diagup\!\!\!x}{\diagup\!\!\!x}\cdot100=44\%\end{array}}[/tex]
