Quick Answers

How do I enter mixed fractions like 1⅔ ?

You use the ‘inclusive’ function (inc).
Shortcut: ⇧i (shift-i).

The price is $220 (inclusive of tax) and the tax is 10%.
The price without tax is:

220 inc – tax

You get the same result with:
220 inc – 10%

Just to confirm the math:
200 + 10% = 220
(10% of 200 = 20)

A common mistake is to use ‘220 – tax’ or ‘220 – 10%’.
This leads to ‘220 – 22 = 198’ since 10% of 220 is 22

Let’s make it a default button. This in turn simplifies its shortcut to i.

Hold down the button i until the menu appears and choose “Inclusive of %”.

To learn more, go to Tax or Percentages.

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