Here you go! Hope this helps!
Yes so he shows this by also doing what is called the flow. After this it is complete
Just asking, what book is it?
Percent change = (new number - old number)/(old number) * 100
percent change = (54 - 48)/(48) * 100 = 6/48 * 100 = 0.125 * 100 = 12.5%