The answer should be 95% I hope this helps :)
Thirty three because I'm just smart like that so you should believe me entirely.
19÷4=4.75
To make it into a percentage, multiply it by 100
4.75×100%=475%
Pressure and Volume are inversely related as:

We can also write it as:

R is the constant of proportionality. Using the first row of given table, we can write:
Thus, the value of R, the universal gas constant is 8.31