Sorry dude, I give up. Gonna leave this one to
@zouzounaki 
But I can assure you that 1.3 is a 30% increase on 1.
But it's not a 30% increase of 10 out of a 1000, or 1 out of 100.
It's an increase of only the 1 , removing what the 1 is out of to determine what the 1 stands for.
imagine your friend had 100 giant bananas. if you had one giant banana, and he gave you 3/10ths, or 0.3 giant bananas, your wealth in giant bananas will have increased by 30%.
now imagine your friend has 1000 giant bananas, and you only have 1/10th, or 0.1 giant bananas. your friend gives you 0.03 giant bananas. despite you now only having 0.13 giant bananas, your share of giant bananas has still increased by 30%.
you can replace giant bananas with anything else and this still works the same.
Your numbers are wrong again!
1/10th of 1000 is 100 , or 10%.
0.1 giant banana out of 1000 would be 1 giant banana in that ratio which is another number again!
Basically you have to increase the 1 in proportion of the 1000 to have it make sense in a ratio perspective. It you just increase the 1 then you aren't increasing the ratio itself, which is what the 10/1000 is, a ratio.
In percentage terms , 10-13 out of 1000 is 1 % turning into 1.3%. It's increased by .3% not 30% in the ratio of the out of 1000 part.
It has to be out of something , that's the part I'm trying to explain. Just because you increase the bottom number, it's in accordance with the top number, in this case the 1000 doesn't increase.
So to turn it back to the real life example and not bananas.
Mortality in that age group has only increased by .3% because 13 out of 1000 is only 1.3%. to increase it by 30% you lower the out of number which means the ratio isn't the same or you increase it by 290.
Your explanation is terrible, why can't you post a link... or summats?
13 minus 10 = 3
3 divided by original total, say 1000, is 0.3% increase.
3 divided by original total, say 20, is 15% increase.
Yes you are increasing the number out of the context of what the number is. It's out of 1000, so that remains out of 1000.
100 vape pens and you have 1 and someone gives you a third of another vape pen. You haven't gained 30% more vape pens , you have only gained a third of one.
It's literally on the percentage. 10 out of 1000 is 1%. So 13 out of 1000 is 1.3% of the total. For every 1000 people with covid , 1.3% die.
By saying it's a 30% increase of what it was , yes that is true but in terms of the X out of 1000, it doesn't increase by the same amount.
They are two different figures which I think is being confused here. The X out of 1000 doesn't change no matter what number it is. It's still out of 1000 for it to be a valid proportional ratio.
