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Calculating percentages is an inseparable aspect of our lives: when shopping we calculate rebates and discounts, in banks we compute interest rates, and we use interest to calculate a company’s earnings.

The word
percentage comes from Latin and means *out of one hundred. *The sign % is a
mathematical symbol which expresses a percentage. Calculating with percentages
has much in common with calculating with fractions except, in this case, the
denominator is always 100.

For example:

3 % =