Near this price
You can buy one of the following:
Buy each rat in New York city
You can buy each rat one of the following items:
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Cups of instant coffee
Cost per cup of instant coffee for £0.05 (A$0.07)
Shopping list
You can buy all of the following:
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2 thousand Scientific calculators
Casio FX-85GT+ scientific calculator for £7.99 (A$12.53) from source