Answer:
A
Step-by-step explanation:
rational numbers are numbers that can be expressed as fractions.
e.g. 1 , 1/2, 2/7
dropped $3 means "-3", increased $6 means "+6"
the price dropped twice so 2(-3) and increased once by 6
so, 2(-3) + 6 = 0
the change in price is $0
