The mass of a bag decreased by 30 kg and became 120 kg.What is the percentage decrease?
To find the percentage decrease, you can use the following formula:
Percentage decrease = (Actual decrease/Original value) x 100%
In this case, the actual decrease is 30 kg and the original value (mass of the bag) is (120 kg + 30 kg) = 150 kg.
So, the percentage decrease is:
Percentage decrease = (30/150) x 100%
Percentage decrease = 20%
Therefore, the percentage decrease is 20%.