Mr. McDonald offers the tractor salesman $2000 for a used tractor. This offer includes 6% sales tax. If the salesman accepts the offer, what is the cost of the tractor, before tax

For this problem we must backtrack, and deduct the sales tax!

So lets make an equation to solve.

original price = final price / (1 + sales tax rate) so

op = 2000 / 1.06 = 1886.80

lets see if this is correct!

1886.80 * 0.06 = 113.208 < - tax

1886.80 + 113.208 = 2000

The salesman will get $1,880 with out the 6% tax