# CASIO

User´s Guide ## Percent Calculations

 Calculation Type Calculation Formula Calculation Method and Key Operations Percentage Example 1 A × B100 What is B percent of A? A B  (%) Ratio Example 2 AB × 100 What percent of B is A? A B  (%) Premium Example 3 A + A × B100 What is A increased by B percent? A B  (%) Discount Example 4 Example 5 A - A × B100 What is A decreased by B percent? A B  (%) Rate of Change (1) Example 6 A + BB × 100 If A is added to B, by what percent does B change? A B  (%) Rate of Change (2) Example 7 A - BB × 100 If B becomes A, by what percent does B change? A B  (%)

Example 1: To calculate 12% of 1500　(180)

• 1500 12  (%)
• 180.

Example 2: To calculate what percentage of 880 is 660　(75%)

• 660 880  (%)
• 75.

Example 3: To increase 2500 by 15%　(2875)

• 2500 15  (%) • 2875.

Example 4: To decrease 3500 by 25%　(2625)

• 3500 25  (%) • 2625.

Example 5: To decrease the sum of 168, 98, and 734 by 20%　(800)
fx-82MS/fx-85MS/fx-300MS/fx-350MS:

• 168 98 734    (STO) (A)  (A)
* 20  (%) • 800.

* As shown here, if you want to use the current Answer Memory value in a mark up or discount calculation, you need to assign the Answer Memory value into a variable and then use the variable in the mark up/discount calculation. This is because the calculation performed when (%) is pressed stores a result to Answer Memory before the key is pressed.

fx-220 PLUS:

• 168 98 734   (Min)   20  (%) • 800.

Example 6: 300 grams are added to a test sample originally weighing 500 grams, producing a final test sample of 800 grams. What percent of 500 grams is 800 grams?　(160%)

• 300 500  (%)
• 160.

Example 7: What is the percentage change when a value is increased from 40 to 46? How about to 48?　(15%, 20%)

• 46 40  (%)
• 15.
•      8 • 20.