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taskmasters
It is important to closely check all the data that are given in the question. Those data are important for finding the result.
Original = 45 
New after decrease = 30
Quantity of decrease = 45 - 30
                                   = 15
Percentage of decrease = (15/45) * 100
                                        = 100/3
                                        = 33.33%
So we get 33.33% as the percentage of decrease. I hope the procedure is clear enough for you to understand. This procedure will help you to solve this type of problems in future with absolute ease.
45 .... 100%
30 ..... x
x = 30 x 100 : 45
x = 66,66667%

The percent of decrease: 100% - 66,66667% = 33,33333%

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