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