Profit, loss and markup percentage
Link cost, selling price and marked price with clear bases.
Key formulas
What this lesson covers
This lesson builds Secondary 2–3 skill in profit loss markup. Read the key formulas, study the worked example, then attempt the written practice and the four-question MCQ review.
Method
Write every step. Name the rule you use (profit loss markup) before substituting numbers. Keep units and signs visible until the final sentence.
Common mistakes
Students often rush the sign, use the wrong percentage base, or cancel terms instead of factors. Pause after each line and ask whether the step is reversible.
Exam habit
Underline the question verb (simplify, solve, factorise, find). Box the final answer and, where sensible, substitute back for a quick check.
Worked example
Worked example — profit loss markup
Problem. Apply the method for profit loss markup with the numbers 5 and 4.
Solution. Identify the rule for profit loss markup. Substitute 5 and 4 carefully with signs in brackets if needed. Complete each operation on a new line. State the final answer clearly and check by reversing one step.
Review quiz
1 / 4Warm-up on profit loss markup: what is 9+5?
Practice questions
- Practice 1 on profit loss markup: compute with the value 23.
- Practice 2 on profit loss markup: change the numbers and repeat the same method.
- Practice 3 on profit loss markup: write one sentence explaining the key rule.
- Practice 4 on profit loss markup: invent a similar exam-style question and solve it.
Study notes
What is the main idea of profit loss markup?
Apply the stated formula or rule with clear steps, then check by reversing or substituting.
How should I revise this topic?
Cover the worked example, redo the practice without notes, then complete the MCQ set and log any wrong options.