Question

a tarifa de um onibus urbano em certo municipio que era R$ 3,00 sofreu dois acrescimos um de 5% no mes de novembro e outro de 8% em agosto do ano seguinte.qual passou a ser a tarifa apos os aumentos

Answer 1

3,00 - 100%
  x     113% (100% + 5% +8%)
 
3,00 * 113 = 100x
100x = 339,00
1x= 3,39

Answer 2

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

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