Convert the first percentage to a decimal: (p = frac{text{original %}}{100})
Convert the increase percentage to a decimal: (i = frac{text{increase %}}{100})
Multiply: (p_{text{new}} = p times (1+i))
Convert back to a percentage: (text{new %} = 100 times p_{text{new}})
If you need the increase in percentage points: (Delta = (text{new %}) – (text{original %}))
Combined formula: (text{new %} = text{original %} times left(1 + frac{text{increase %}}{100}right))