Concept:The operation a$b is defined as a×(b+c), where the constant c changes with each step.Explanation:From 8$4=80, we see 8×(4+6)=8×10=80. The added number is 6.From 7$3=56, we see 7×(3+5)=7×8=56. The added number is 5, which is one less than 6.The pattern shows the added number decreases by 1 each time: 6,5,….For 6$2, the added number should be 4 (since 5−1=4).Thus, 6$2=6×(2+4)=6×6=36.Answer:Option A: 36