To find a percentage P out of a quantity Q, we use the formula:
[tex]Q\cdot\frac{P}{100}[/tex]In this case, the quantity is $318.47 and the Percentage is 1.64%, then:
[tex]318.47\cdot\frac{1.64}{100}=318.47\cdot0.0164=5.222908[/tex]Then the correct answer is option b.$ 5.22