If you set up what you know as a ratio and compare it with what you want, you can determine your answer. You know that $15.37 is 106% of the cost, the original 100% + 6% for the tax. You are wanting to find out the amount for 100%. So, compare the two, and solve for x.

15.37/106 = x/100

x = $14.50

You can check for accuracy by multiplying the $14.50 by .06 for the 6% tax, and you get $.87. Add this amount to the $14.50 and you get your original amount, $15.37.

15.37/106 = x/100

x = $14.50

You can check for accuracy by multiplying the $14.50 by .06 for the 6% tax, and you get $.87. Add this amount to the $14.50 and you get your original amount, $15.37.