monica paid sales tax of 3.50 when she bought a new bike helmet if the sales tax was 7% how much did the store charge for the bike helmet before tax
To find out the total cost of the bike helmet before tax, we can set up the following equation:
Total cost before tax + Sales tax = Total cost after tax
Let's denote the total cost before tax as "x". Since the sales tax is 7%, we can express it as a decimal by dividing it by 100 (0.07). Therefore, the equation becomes:
x + 0.07x = x + 0.07x + 3.50
Simplifying the equation, we have:
0.07x = 3.50
Now, let's solve for x:
x = 3.50 / 0.07
Dividing 3.50 by 0.07, we get:
x = 50
Therefore, the store charged $50 for the bike helmet before tax.
cost of helmet ---- x
solve for x
.07x = 3.5