The store charged $50 for the bike helmet before sales tax.
According to the question,
We have the following information:
Monica paid a sales tax of $3 when she bought a new bike helmet. And the sales tax rate was 6%.
Now, let's take the cost of the bike helmet charged by the store before sales tax to be $x.
So, we will have the following expression:
6% of x = 3
Removing the percentage sign, we have the following expression:
6x/100 = 3
Using the cross multiplication method:
6x = 300
Dividing by 6 on both sides of the equation:
x = 300/6
x = $50
Hence, the store charged $50 for the bike helmet before sales tax.
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