Currency exchange-rate comparison

Currency exchange-rate comparison

Secondary 2
8 marks
TGM Original Questions

Optional extension

A tourist exchanges \(14\,400\) baht at \(x\) baht per Singapore dollar. Later the rate is \((x+2)\) baht per dollar and he receives S$30 less.

  1. Write the first Singapore-dollar amount.[2]
  2. Write the later amount.[2]
  3. Form an equation and show that \(x^2+2x-960=0\).[2]
  4. Solve and find the later exchange rate.[2]

Solution:

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Answer:(a) S\(\(\dfrac{14400}{x}\) (b) S\(\)\dfrac{14400}{x+2}\) (c) \(x^2+2x-960=0\) (d) \(32\) baht per S$1.

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