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Econometrics

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Water Filter

EMETRC-SY2NKZ

The local water supply has 3 parts per million (ppm) magnesium, 2 ppm iron, 1 ppm sulphur, and 4 ppm chlorine.

If a new filter-manufacturer claims it can reduce each of these by 25 percent, then how many total parts per million in contaminants will remain?

A

2.75

B

4

C

6

D

7.5

E

40