Question

a tarifa de onibos urbano em certo municipio,que era de 3,00 reais sofreu 2 acrecimos,um de 5porcento e outro de 8porcento. qual passou a ser a tarifa apos os aumentos?

Answer 1

3,00+5%= 3,15
3,15+8%=3,40

Answer 2

$\tt 5\% \to \dfrac{5}{100}=0,05\to 0,05+1=1,05 \\\\\\\sf 8\% \to \dfrac{8}{100}=0,08\to 0,05+1=1,08$

$\tt 100x\:=\:3\cdot 5\\\\\\\tt \displaystyle 100x=15\\\\\\\tt \frac{100x}{100}=\frac{15}{100}\\\\\\\boxed{\boxed{\sf x=\frac{3}{20}\to0,15}}\\\\\\\tt 100x\:=\:3,\:15\cdot 8\\\\\\\tt 100x=25.2\\\\\\\tt \frac{100x}{100}=\frac{25.2}{100}\\\\\\\boxed{\boxed{\sf x=0,252}}\\\\\\\\\sf 0,252 + 3,15\to \boxed{\boxed{\sf = 3,40}}$