0580/13 May/Jun 2021, Question 11: Constructing Equations
Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Calculator · 2 marks
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The question, in short
Maria buys n pencils at p cents each and pays with a $y note. Find her change in cents, expressed in terms of n, p and y.
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Solution · 2 marks
- 1$y = 100y cents
- 2Cost of pencils = n × p = np cents
- 3Change = 100y − np cents
Answer100y − np
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