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O-LevelMathematicsAlgebra and graphs4024/12 · May/June 2014 · Q123 Marks

A café sells hot drinks. On Monday it sells 80 teas, 60 coffees and 40 hot chocolates. On Tuesday it sells 70 teas, 90 coffees and 50 hot chocolates. A cup of tea costs $0.80, a cup of coffee costs $1 and a cup of hot chocolate costs $1.20. This information can be represented by the matrices M and N below. M = (80 60 40; 70 90 50) N = (0.8; 1; 1.2)

  1. (a)Work out MN.[2]
  2. (b)Explain what the numbers in your answer represent.[1]

Mark scheme

Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.

  1. [2] (172; 206) oe
  2. [2] B1 for one value correct
  3. [1] Amount taken on Monday and Tuesday

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About this question

Topic
Algebra and graphs, O-Level Mathematics (syllabus 4024). Structured question, 3 marks.
Source
O-Level Mathematics, May/June 2014 Paper 1 Variant 2, question 12.

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