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Personal finance extension calculators cover percentage mathematics — percent change, markup, discount, and proportional calculations — that underpin retail pricing, investment returns, and everyday deal evaluation.
Водич корак по корак
- 1Percent change: (new − old) / old × 100
- 2Markup: (selling price − cost) / cost × 100
- 3Discount: original price × (1 − discount %) = final price
Worked Examples
Инпут
Item marked up 40% from $50 cost
Резултат
Selling price = $70 · Gross margin = 28.6%
40% markup ≠ 40% margin — margin is calculated on sell price