A self-published author found that when she sold her debut novel, as an e-book, at a price of $3.99, she sold 19 copies in one day. When she lowered the price to $1.99, she sold 43 copies in one day. Assuming the relationship between the price and the number sold is linear, and that she can set any price she chooses as long as it is greater than or equal to zero, what price will maximize her daily revenue? Round your answer to the nearest cent

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