SOLUTION: A population of bacteria originates with 2500 bacteria. After a harmful substance is introduced into the environment, the rate of decline of the bacteria population is 10% per hour

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Question 1158303: A population of bacteria originates with 2500 bacteria. After a harmful substance is introduced into the environment, the rate of decline of the bacteria population is 10% per hour. In addition, 65 bacteria are added to the population each hour. How many bacteria are in the population after two hours.
Answer by Shin123(626) About Me  (Show Source):
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10% of 2500 is 250. So after one hour, there are 2250 bacteria left. Adding the 65 bacteria, there are 2315 bacteria after one hour. 10% of 2315 is about 232 bacteria. So there are 2315-232%2B65=2148 bacteria.