Percentages are calculated using the % symbol.

When added or subtracted the percentage symbol resolves to one percent of the value being added or subtracted from. The following equation calculates the price of a $140 item with 15% tax (140 + (15÷100)×140).

140+15%

In all other cases the percentage symbol resolves to a fraction out of 100. The following equation calculates one quarter of 80 apples ((25÷100)×80).

25%×80