White calculator with tax calculation function - Brand: SHARP - Model: EL-77H - Features: Tax calculation function - Color: White - Type: Calculator It's an old model, but the tax rate can be changed, and it's currently set to 10%. You can easily set and change the tax rate by pressing the "tax included" button, then the desired tax rate (10 for 10%), and then the tax rate button again. It works normally. Solar powered Thank you for looking.