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If you deduct 2.50 from 2.80 you find there has been a 0.30 increase. If you then divide 0.30 by the original amount of 2.50 and multiply the resulting answer by 100 (to get it in %) you will find that this corresponds to an increase of 12%.
pi X radius squared X the percent of the circle.
0.245 = 24.5% because a decimal is a portion of 1 while a percentage is a portion of 100, so to convert a decimal to a percentage you simply multiply it by 100.
I think it is 30/100 times 300/1
"Dose" is a measured portion of a medicine. I am not aware of any grades that have measured quantities of medication!