Question

a tarifa de onibus em certo municipio era 3,00 sofreu dois acrescimos um de 5% no mes de agosto e outro de 8% em janeiro qual o valor da tarifa apos os aumentos

Answer 1

Resposta:  R$3,40

Explicação passo-a-passo:

5/100=0,05 => 1+0,05=1,05

3*1,05=

3,15

8/100=0,08 => 1+0,08=1,08]

3,15*1,08=

3,40

Answer 2

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

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