It would be 2.5% because you would set it up as 0.5=p x 20 you divide each side by 20 which should equal 0.025. you move the decimal two places to the right so p actually equals 2.5%
The last option is correct
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Answer: 1. with his family's approval 2. on a major remodeling project 3. into a bright studio
Explanation: A prepositional phrase begins with a preposition (with, on, into) and ends with a noun (approval, project, studio). Sometimes it has an article (the, a, an) or a possessive (family's) in the middle, and sometimes it has nothing but the preposition and the noun: example: at home, in time