The bacteria in a a culture grows by $10$ % in the first hour, decreases by $10$ % in the second hour and again increases by $10$ % in the third hour.If the count of bacteria in the sample is $121000000$ , what will be the count of bacteria after 3 hours?

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Solution

After 1st Hour bacteria increase by 10%
therefore Count of bacteria after 1st hr $= 121000000 + 121000000 \times \frac{10}{100} = 133100000$
After 2nd Hour bacteria decrease by 10%
therefore Count of bacteria after 2nd hr $= 133100000 - 133100000 \times \frac{10}{100} = 119790000$
After 3rd Hour bacteria increase by 10%
therefore Count bacteria after 3rd hr $= 119790000 + 119790000 \times \frac{10}{100} = 131769000$

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The bacteria in a a culture grows by 10% in the first hour, decreases by 10% in the second hour and again increases by 10% in the third hour.If the count of bacteria in the sample is 121000000, what will be the count of bacteria after 3 hours?

The bacteria in a a culture grows by $10$ % in the first hour, decreases by $10$ % in the second hour and again increases by $10$ % in the third hour.If the count of bacteria in the sample is $121000000$ , what will be the count of bacteria after 3 hours?