Suppose salted water of concentration 0.4 g f m3 is added to a reservoir of volume 2500 m3 at a rate 3 m3r' minute. Assume the water in the reservoir is well mixed and the same amount of mixed water is removed from the reservoir. Let Q\") be the quantity, in grams, of salt in the reservoir at time I. If Q(0) = 8000 grain, which one of the following is closest to Q(500)? Q a) 4802 O b) 4822 O c) 4832 Q d) 4812 0 e) 4842 O f) 4852