The percent change in anything is the change divided by the original, all times 100%. (I’ve emphasized the word “original” because the most common mistake in these kinds of problems is dividing the ch...The percent change in anything is the change divided by the original, all times 100%. (I’ve emphasized the word “original” because the most common mistake in these kinds of problems is dividing the change by the wrong thing.) The change in a quantity is the new value minus the original value. (The most common mistake here is reversing the order.
