Suppose in one year, total revenues from digital sales of pop/rock, tropical (salsa/merengue/cumbia/bachata), and urban (reggaeton) Latin music in a certain country amounted to $21 million. Pop/rock music brought in twice as much as the other two categories combined and $8 million more than tropical music. How much revenue was earned from digital sales in each of the three categories?   pop/rock music$  = million tropical music$  = million urban Latin music$  = million

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