Mathematics - Percentages - Percentage increase and decrease - Increase and Decrease Formulas

6 steps: (1) Percent increase: new = original + (percent × original) = original × (1 + percent/100). (2) Example: $60 increases by 15%. New = 60 × 1.15 = $69. (3) Percent decrease: new = original × (1 - percent/100). (4) Example: $80 jacket, 30% off. New = 80 × 0.70 = $56. (5) Finding the percent ch