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It means that it is the fourth edition of the DSM.
If you mean: 5 20 then it is 1 4
17% of 520= 17% * 520= 0.17 * 520= 88.4
70% of 520= 70% * 520= 0.7 * 520= 364
30% of 520 = 156= 30%/100% * 520= 3/10 * 520= 0.3 * 520= 156