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• there must be a public method to use
• the method must not be void
• the method can be static or non-static
• the method must have 2 or more parameters
• the parameters is paired so the first 50% is applied to the oldExchnage oldExchange and the reminder 50% is for the newExchange
• .. meaning that there must be an equal number of parameters, eg 2, 4, 6 etc.

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