If 24 is increased to 30, the percent of increase is

It is very important to look at all the information's that are given in the question. these information's will in getting to the desired result.
initial number = 24
final number = 30
amount of increase = 30 - 24
                                  = 6
then
percentage increase = (6/24) * 100
                                    = 100/4 percent
                                    = 25 percent
so the percentage of increase is 25%. i hope the procedure is clear enough for you to understand. you can use this method for solving similar type of problems in future without requiring any from outside.