Number of phone surveys A research institute conducted phone and mail surveys. The total cost of conducting these survevs was $5,000. The line shown models the possible combinations of phone and mail surveys that the institute could have conducted. 175 150 125 75 50 25 ++ 25 50 75 100 125 150 175 200 0. Number of mail surveys According to the model, what was the cost for each phone survey conducted? A) $200 B) $125 selE=se sel C) D) $25 40

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