Best Buys & Rates
Best buy: compare cost per unit. Lower unit cost = better value.
Exchange rates: multiply/divide to convert between currencies.
Example
Example: A: 500g for £2 → £0.004/g; B: 300g for £1.50 → £0.005/g → A is cheaper.
Example: £1 = $1.20 → £50 × 1.2 = $60
Practice
If £1 = $1.20, how many USD do you get for £50?
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