WILL GIVE BRAINLIEST AND 20 POINTS! Determine the form of each augmented matrix:

4 11 2 −6
0 −5 8 7
0 0 −2 3

1 0 0 −6
0 1 0 3
0 0 1 3

1 0 3 −6
0 6 0 8
7 0 1 13

Row echelon form
Reduced row echelon form
Neither

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?