Monica pay sales tax of $1. 50 Cent when she bought a new bike helmet. If the sales tax rate was 5% how much did the stores charge for the helmet before tax?

Answer: $30 charge for the helmet before tax

Step-by-step explanation:

Let P the pre-tax subtotal

Sales tax = P·5/100

Since we know the sales tax paid, we can substitute its value here:

P·5/100 = $1.50

P = $1.50·100/5 = $150/5 = $30, charge for the helmet before tax

Answer: $30 charge for the helmet before tax

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