In france grapes are 1.68 euros per kg. what is the cost of grapes in dollars per pound if the exchange rate is 1.39 dollars per euro

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

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