Which is the best for money €800 table with 50% off or €600 table with 30% off

€800 with 50% = €400. €600 with 30%=€420

50% would be turned into a decimal so .5
next you would multiply it by 800 so 800*.5=400
then you subtract 800-400=400
Then you do the same thing with the other side
30% = .3
600*.3=180
600-180=420 
So $800 with 50% would be a better deal

Igot the answer of 15.8 years.