I swear people like you are why I lose faith in humanity.
Little reminder from my elementary school
Golden one adds 1225, purple 6%
To solve at which stat level 6% equal 1225 you need to use proportions.
1225 = 6%
X = 100%
X = (1225*100)/6
X= 20416,6
Answer: Purple ginseng is better than yellow one when stat you are interested in is higher than 20416. It took me longer to write this than calculate problem itself.