Storage space on a computer is measured in gigabytes (GB) and megabytes (MB), where 1\:GB=1024\:MB. Julia has an empty 300\:GB hard drive and puts 300\:000\:MB of data onto it. How much storage space on the hard drive remains empty?
Answer Choices
A. 72\:MB
B. 720\:MB
C. 7200\:MB
D. 7.2\:GB
E. 72\:GB