Question

a refrigerator sale for $850. With a sales tax rate of 6.5% determine the total price.

Answer 1

$850 x .065 = $55.25

$850.00
+ $55.25
-------------------------
$905.25

Answer 2

if we take the 850 to be the 100%, then how much is 6.5% of that?

$\bf \begin{array}{ccll} amount&\%\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 850&100\\ t&6.5 \end{array}\implies \cfrac{850}{t}=\cfrac{100}{6.5}\implies \cfrac{850\cdot 6.5}{100}=t$

so the tax is "t", add that to the 850 sale price, and the total price is 850 + t.