Increase 1 litre by 20%

Answer 1

To increase 1 litre by 20%, you need to add 20% of 1 litre to 1 litre.

20% of 1 litre is:

(20/100) * 1 litre = 0.2 litres

So the total volume after 20% increase would be:

1 litre + 0.2 litres = 1.2 litres

Therefore, to increase 1 litre by 20%, you need to add 0.2 litres, resulting in a final volume of 1.2 litres.