Answer: If he has more than 80 feet of planks he can make at least 17 birdhouses, and that's $335.75
Explanation:
80/4.5 = 17.7 (at least 17 birdhouses)
17 x 19.75 = 335.75
Answer:
335.75
80 / 4.5 = 17.8
19.75 * 17 = 335.75
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