To calculate the percent increase you have to proceed as follows:
First step: calculate the difference between the new number and the original number:
[tex]54-48=6[/tex]Second step: divide the difference by the original number
[tex]\frac{6}{48}=\frac{1}{8}[/tex]Third step: multiply the result by 100, to express the result as a percentage
[tex]\frac{1}{8}\cdot100=12.5[/tex]The percentual increase is 12.5%