You would multiply 510 by 1.2 to get your answer.
The idea is:
510 plus twenty percent of 510 would be
1 X 510 + .2 X 510. Factoring out the 510 from each of these terms you get
510 (1 + .2)
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They are equal
If 20 = 100% then 45 = 225% So, 45 is an increase of 125% on 20
add 25ml more of solution x * 20 = 100 * 25 x = 25
24, because (.20)(120)=24.
20% = 1⁄5