SOLUTION: A population of bacteria originates with 500 bacteria. After a harmful substance is introduced into the environment, the rate of decline of the bacteria population is 2% per hour.

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Question 1083544: A population of bacteria originates with 500 bacteria. After a harmful substance is introduced into the environment, the rate of decline of the bacteria population is 2% per hour. In addition, 30 bacteria are added to the population each hour. How many bacteria are in the population after two hours (round your answer to the nearest whole number)?
A) 345
B) 540
C) 566
D) 450
Answer by Boreal(15235) About Me  (Show Source):
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2% of 500 is 10
490 after 1 hour. Add 30 for 520, and 2% of that is 10.4, so 509.6. Add 30 more as the last thing to do at two hours, and there are 539.6 or 540,
B.