No. It take 6wKS to save 240 and he has 120 add 240=360. He short 40 dollars
Solution given in the attachment.
Well, an interior angle plus an exterior angle has to equal 180°. Also, the sum of the interior angles is represented by this formula: [-2 + n]180, whereas the sum of the exterior angles all add up to 360°, and is represented by this formula: 360/n [let "n" represent the number of sides in every polygon].