Jack started learning to program with Unity. He read that the optimum space required to install Unity software is 85 GB but he has only about 19 GB of disk space available. He found it out when his machine reached the lowest amount of space, 21 GB, and he remembered that the higher bound of his disk is 90 GB. But Jack is unable to visualize these numbers. Help him by creating some graphical representation.
Tip: The disk's minimum space is 0 GB and the maximum space is 100 GB.