**T**o calculate the percentage difference between two prices enter the values into the

*First Price*and

*Second Price*fields then click on one of the

*Mode*buttons. You can also use decimal or whole numbers in these fields. The result will give a percentage increase, decrease, or difference between the two numbers according to the mode selected. Note that if the

*% increase*button is pressed the original number is the lower of the two numbers and, conversely, if the

*% decrease*button is pressed the original number is the higher of the two numbers.

To show by how much the first price changes given a percentage value over how many years use the *Cumulative Interest* form and click a button.

The *Interest* form gives the percentage change of the interest earned from a given capital that gets you the final balance of *First Price*. This is where the bank gives you interest in a dollar amount and the final balance after the interest is added. To determine what the interest is as a percentage enter the final balance in the *First Price* field and the interest earned in the *interest gained* field.