I need help to understand this problem for my end or course exam!!!!

Answer:
B Flat fee = 19 Each cubic yard =24
Step-by-step explanation:
substract 19 from 67 to know how much 2 yards are)
67-19=48
48/2 = 24 (each cubic yard =24)
19= flat fee
5x24 = 120
120 +19=139
7x24=168
168+19=187
8x24=192
192+19=211