Unit 2 · Class 7 IB MYP · Formula Sheet
Percentages & Proportional Reasoning Formulas — Class 7 IB MYP
Calculate percentages, discounts, and markups; solve proportional reasoning problems.
Key Formulas
Percentage
\text{\%} = \dfrac{\text{Part}}{\text{Whole}} \times 100
Percentage Increase
\text{New} = \text{Original} \times \left(1 + \dfrac{r}{100}\right)
Percentage Decrease
\text{New} = \text{Original} \times \left(1 - \dfrac{r}{100}\right)
Reverse Percentage
\text{Original} = \dfrac{\text{New}}{1 \pm \frac{r}{100}}
Worked Examples
1Using: Application
Apply the key formula from this topic to a sample problem.
Step 1: Identify the formula.
Step 2: Substitute the values.
Step 3: Simplify to get the answer.
Answer: See solution above
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