Answer:
A. 
Step-by-step explanation:
I could not make clarifications of what you are asking, but this is similar to 
I am joyous to assist you anytime.
Of 85% of cars sold where not black then 100-85% where black = 15%
let the number of cars sold be y
then 15%*y=300
y= 300 divided by 15%
= (300*100)/15
=2000
therefore 2000 cars were sold
It is a mixed number because 12/2 can be written as 6 instead of 12/2