Percent Change Word Problem Practice. For example, 10 percent means 10 out of 100. The word percentage is originated from the latin word “per centum”, which.

Percentage change is = (amount of change / original amount) x 100 % = (10 / 20) x 100% = 0.5 x 100 % = 50 %. The word percentage is originated from the latin word “per centum”, which. To solve a mathematical equation, you need to find the value of the unknown.