O-LevelMathematicsAlgebra and graphs4024/12 · May/June 2014 · Q72 Marks
The cost of a mirror is directly proportional to the square of its width. A mirror of width 40 cm costs $24. Work out the cost of a mirror of width 60 cm.
- The cost of a mirror is directly proportional to the square of its width. A mirror of width 40 cm costs $24. Work out the cost of a mirror of width 60 cm.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.
- [2] 54
- [2] C1 for answer 36
- [2] Or B1 for k = C⁄200 oe or for 24⁄60²
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