It was a tax imposed in Roman times in the markets as a 'sales tax'
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No, they are not.
Percents are used to calculate tax on EVERY store purchase,and to calculate discounts on every "special" or "bargain".If you can't calculate percents, you can't catch mistakes or avoid being cheated.
No but percentages are ratios.
12.8 = 1,280%
1.4 = 140%