You need at least two numbers to find an LCM. If that's 5 and 30, the LCM is 30.
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530% = 530/100 or 53/10 in fraction
530 + 50% = 530*1.5 = 795
5.30 to % rate:= 5.30 * 100%= 530%
The percentage of 530 out of 815 is approximately 65%.
20 - 530 = -510