00:01
So sarah paid $40 ,230, including sales tax for a car, had a tax rate of 8%.
00:11
And what we want to do is figure out what the cost of the car was before tax.
00:16
So what we're going to do is, so the way sales tax works is we take our original cost, so i'll call this c, and then we're going to add one plus our rate to this, or our tax rate.
00:32
And this is going to give us how much we actually ended up paying.
00:40
So we paid $40 ,230.
00:47
Our tax rate, well, we want to put this into a percent, i mean into a decimal since it's in a percent, so we would divide that by 100 to get 0 .08, so this is going to be r.
00:59
Actually, before we plug stuff in, let's go ahead and just solve for c...