9/20
A percentage is the same as showing a number over 100 and if we multiply 20 by 5 we get 100. So if we multiply 9 by 5 we get 45, giving us 45/100 which can be shown as 45%.
As a decimal, well if we say 100% equals 1.0, then 45% equals 0.45
Well if rounding it to the tenths is 230 then you would round back down to 200
Yes, 1L is 1000 mL so 10L is 10,000 mL
With what? I don’t see anything