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The table below shows the cost of downloading songs from a website. Number of SongsNumber of SongsTotal CostTotal Cost 66dollar sign, 1, point, 8, 0$1.80 1212dollar sign, 3, point, 6, 0$3.60 2020dollar sign, 6$6 What is the constant of proportionality between the total cost and the number of songs?

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The price per song isn't the same throughout this list. It seems like buying more songs might change the price you pay for each one. For example, buying 6 songs costs $0.3 each, but buying 20 songs costs a different price per song.
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