You find a sales receipt from a store that shows the total price as $40, and the total amount paid including sales tax as $42.
Write an equation you can use to find the sales tax rate r.
40(1 + r/100) = 42
or
r/100 = (42-40)/40
To find the sales tax rate "r," we can set up the following equation:
Total Amount Paid = Total Price + (Total Price * Sales Tax Rate)
$42 = $40 + ($40 * r)
Therefore, the equation to find the sales tax rate "r" is:
$42 = $40 + ($40 * r)
To find the sales tax rate, we need to set up an equation using the given information. Let's call the sales tax rate "r."
The total price before tax, let's denote it as "p," can be calculated by:
p = Total price + Sales tax
In this case, the total price is $40 and the sales tax is the product of the total price and the sales tax rate:
p = $40 + ($40 * r)
Now, we were also given that the total amount paid including sales tax is $42. We can express this using the formula:
Total amount paid = Total price + Sales tax
Substituting the values:
$42 = $40 + ($40 * r)
So the equation we can use to find the sales tax rate "r" is:
$42 = $40 + ($40 * r)