# How to use Cost Sell Margin on your Casio Calculator

You’ve noticed the trusted 3 keys displayed on your favourite Casio office calculator: **Cost, Sell, and Margin**. Chances are while you realise what they do, you might not be certain how to easily calculate using them.

For this example, we’re going to use our popular model, the **DF120FM**. At the top of your calculator, you’ll notice the 3 keys: Cost | Sell | Margin

**Example 1:** What’s the cost of an item that sells for $150 with a 30% margin added?

Cost: ?, Selling Price: $150, Margin: 30%

- Use the AC button to turn your calculator on
- Now, set the selling price. Input 150 and press the ‘SELL’ button
- You’ve now told the calculator that 150 is the selling price, and can now set the margin amount
- Input 30 and press the ‘MAR’ button
- You’ve now told the calculator that 150 is selling price with a 30% margin
- From here, press ‘COST’, and the calculator will display the final amount on your screen, equalling $105. You’ll notice a ‘Cost’ indicator will be displayed at the top of your screen, in the centre

**Example 2:** What’s the selling price of an item that costs $120 after a 40% margin is added?

Cost: $120, Selling Price: ?, Margin: 40%

- Use the AC button to turn your calculator on
- Now, set the cost price. Input 120 and press the ‘COST’ button
- You’ve now told the calculator that 120 is the cost price, and can now set the margin amount
- Input 40 and press the ‘MAR’ button
- You’ve now told the calculator that 120 is cost price with a 40% margin
- From here, press ‘SELL’, and the calculator will display the final amount on your screen, equalling $200. You’ll notice a ‘Sell’ indicator will be displayed at the top of your screen, in the centre

**Example 3:** What’s the margin on an item that costs $800 and sells for $2,000?

Cost: $800, Selling Price: $2,000, Margin: ?

- Use the AC button to turn your calculator on
- Now, set the cost price. Input 800 and press the ‘COST’ button
- You’ve now told the calculator that 800 is the cost price, and can now set the selling price
- Input 2,000 and press the ‘SELL’ button
- You’ve now told the calculator that 800 is cost price with a selling price of 2,000
- From here, press ‘MAR’, and the calculator will display the final amount on your screen, equalling 60%. You’ll notice a ‘MAR %’ indicator will be displayed at the top of your screen, on the right

Models with this feature:

- WD220MS
- HR8RC
- DF120FM