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In 2007, 4% of people buying new cell phones purchased a bluetooth earpiece during the same transaction. In 2012, 28% of people buying new cell

In 2007, 4% of people buying new cell phones purchased a bluetooth earpiece during the same transaction. In 2012, 28% of people buying new cell phones purchased a bluetooth earpiece during the same transaction.

Of the following choices, what is correct about the growth of bluetooth sales?

It rose by 24%.

It rose by 12%.

It rose by 24 percentage points.

It rose by 120 percentage points.

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