Question 130591
use the formula:   part/total=%/100   The total number must follow the 
                                      word "of" 
                                      The part number is next to the word "is". 
4/50=%/100               You now have a proportion.   Cross multiply.
50%=400    Replace % with any variable.
50x=400    Now divide both sides of the equation by 50.
x=8