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Self Doubt regarding C-SCAN

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Consider a disk has 200 cylinders, numbered from 0 to 199. At some time the disk arm is at cylinder 100, and moving towards right direction. There is a queue of disk access requests for cylinders 30, 85, 110, 100, 105, 126, 135, 55 and 195. The difference in the distance that will be traversed by the R/W head when the LOOK algorithm is used compared to the CSCAN algorithm is ________.

Please also mention the method of C-SCAN.

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