book Maths Puzzle Numerical Ability

Debit-card transactions. The total volume (in US dollars) of debit card transactions was $8.2 billion in 1990. In 1999, the total was $157.9 billion. Find the average rate of change in total debit card transactions from 1990 to 1999.

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I am having some difficulty with this problem...
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List all of the potential rational zeros of the polynomial function.Do not attempt to find the zeros. f(x)
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