Ahardware store had 300 gallons of white paint on the shelves at the beginning of the month. at the end of the month, there were 252 gallons of white paint. what is the percent decrease in the number of gallons of white paint from the beginning of the month to the end?

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.