**The purpose of the buttons on the calculator**

1. “AC” or “CA”: Clear all, clear all the content entered into the calculator to 0.

2. “C” or “CE”: cancel key to clear the content entered in the previous step.

For example, when “1+2” is mistakenly entered as “1+3”, press “C” and then enter “2”.

3. “M+”: When doing addition operation, let the calculator remember the addition.

4. “M-“: When doing subtraction calculations, let the calculator remember the subtraction.

5. “MR”: memory recall, read the stored content key, used to display the calculation results up to that time.

6. “MC”: memory clear, delete the content saved by the memory key.

7. “MRC”: “MR” and “MC” are combined, click the function as “MR”, and double-click the function as “MC”.

For example, to calculate “1*2-2*3”, operate in the following order: 1*2, M+, 2*3, M-, MR.

8. “GT”: grandtotal, the total value key, the sum of the total number of numbers obtained after pressing the equal sign.

For example, “10*2+5*5”, operate in the following order: 10*2=, 5*5=, GT.

9. “MU”: mark-up and mark-down, to calculate interest rates and tax rates.

The method of use is as follows:

What is the purpose of the buttons on the calculator

1. Addition: A+B MU, the calculation formula is: 100+A÷B×100;

2. Subtraction: A-B MU, often used to calculate the rate of change, the calculation formula is: (A-B)÷B×100;

3. Multiplication: A×B MU, often used in the calculation of mark-ups, the calculation formula is: A+A×B%;

4. Division: A÷B MU, often used in the calculation of the price, the calculation formula is: A÷(1-B%), when you press the MU button again, you can get the profit value, the formula is: A÷(1-B %)-A.