The sale price on a TV is 30% off the regular price. If the regular price is $420, how much will you save and what is the final cost after 8% sales tax?

1 Answer
Nov 6, 2015

You will save $126
The final price will be $317.52

Explanation:

To solve this problem first we need to take the numbers out of the word problem

So we have base price: $420
Discount: 30% of $420
Tax: 8% of $420

We then simplify all the percents into actual dollar values (I'm assuming you know 100%=1 for these calculations)
.3*420=126 is your discount

So our new price is
420-126=294

Next we find the tax
.08*294=23.52

So our new price is
294+23.52=317.52

This is our final price

The formula for this is
(%tax+100%)(basePrice-basePrice*%discount)

In this case
(8%+100%)($420-420*30%)