Catherine paid $185.30 for an MP3 player. If the price paid includes a 9% sales tax, which of the following equations can be use d to determine the price of the MP3 Player before tax? (Let x represent the cost of the MP3 player and y represent the total cost after tax.)
1 answer:
y = $185.30
x = the orignal cost minus 9% or .09. To increase an objects value by 9% you need to multiply by 1 + .09 or 1.09. So, x being increases by 9% would equal y or $185.30
1.09x = y
1.09x = $185.30
Divide both sides by 1.09
x = $170
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