Hey there!
Your answer is $220.
First off, let's make sure we understand that the sales tax is applied after the 25% discount has been applied.
So, the price he paid was 108% of the discounted price: 100% plus the 8% sales tax.
108% in decimal form is 1.08 (move the decimal 2 places to the left).
To get the final price after tax from the price before tax, you would multiply the price before tax by 1.08, so we'll do the opposite and divide the final price by 1.08.
178.20 ÷ 1.08 = 165
The discounted price is $165.
This is 75% of the original price, which is 0.75. Just like the last step, we are going to divide by this to get the original price of the phone.
165 ÷ 0.75 = 220
The original price of the cell phone is $220.
Hope this helps!
