The graph above shows the price that a company charges for an order of batteries, depending on the weight of the order. Based on the graph, which of the following statements must be true?

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The rate is constant for two periods on the graph. The rate (slope) is larger when the weight of the order is less than 80 than when it is greater than 80.

There is no initial fee, since the cost is $0 when the weight of the order is 0.