<h3>
Answer: 70 dollars per TV</h3>
============================================================
Explanation:
I'm assuming that each TV he sells has an extended warranty.
If he sells 14 such TVs, then he earns 20*14 = 280 dollars from the warranties alone. We're told he earns a total of $1260. This means that 1260-280 = 980 dollars was earned from the fixed amount he gets per TV.
Divide this over 14 to get 980/14 = 70
-------------
Here's an algebraic way to approach this
x = fixed amount he gets per TV
x+20 = fixed amount plus the extra $20 to get the warranty
14(x+20) = total amount he gets
14(x+20) = 1260
To solve for x, we could take two paths. One path is to divide both sides by 14 and subtract 20 from both sides later
So we would do:
14(x+20) = 1260
x+20 = 1260/14
x+20 = 90
x = 90-20
x = 70
Or we could distribute first, then subtract 280 from both sides, and divide both sides by 14. This basically follows the path described in the first section at the top.
14(x+20) = 1260
14x+14*20 = 1260
14x+280 = 1260
14x = 1260-280
14x = 980
x = 980/14
x = 70
Either way, we end up with 70 dollars as the answer