Respuesta :
[tex]\bf \begin{array}{|c|ll}\cline{1-1}\textit{a\% of b}\\\cline{1-1}\\\left( \cfrac{a}{100} \right)\cdot b\\\\\cline{1-1}\end{array}~\hspace{5em}\stackrel{\textit{18\% of 43}}{\left( \cfrac{18}{100} \right)43}\implies 7.74\\\\\\\stackrel{\textit{total expense}}{43+7.74}\implies 50.74[/tex]
