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15. Example 3 – Exchange Rates – continued
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Option 2: Make up a rule or equation
You could try a flow chart that converts $NZ into Euros.
The problem here is to work out the exchange rate. Try the info you are given:
So 780r = 370 so r = 370 ÷ 780 (r 0.47)
Your rule for converting $NZ to Euro is e = r (k-20) where e = the number of Euros, k = number of $NZ and r = the rate.
Question: How can you reverse the flowchart to find the rule for how many $NZ a certain number of Euros will cost?
Extensions: Try other exchange rates. For example $NZ1000 = $US709.
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