Respuesta :

[tex]\bf 500\pm 4\%\\\\ -------------------------------\\\\ \textit{how much is 4\% of 500? }\cfrac{4}{100}\cdot 500\implies 20 \\\\\\ 500\pm 4\%\implies 500\pm 20\implies 500-20...... 500+20\\\\\\ 480...... 520[/tex]