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20 microns is 0.002cm
100 microns is 20 times thicker than 5 microns
20 decimeters / 0.254 decimeters/inch = 79 inches
1 mm = 1000 microns. 20/1000=.02mm
Convert 20' x 10' to inches: 20*12 " x 10*12 " = 240x120. Then find the area of both: 28800 for 20 by 10 and 144 for 12 by 12. Divide: 28800/144 is equal to 200.