Question

The bacteria in a culture grew by 8% in the first hour, decreases by 8%
/ in the second hour, and again increases by 7% in the third hour. If
the end of the third hour the count of bacteria is 12170 thousands, find
the original Count (in thousands) of bacteria in sample.​

Answer 1

Step-by-step explanation:

Hola !

Change in bacteria can be calculated by the present method,

7/100×12170

=851.9

If we add this value to count we can came to know the total count.

12170+851.9

=13021.9

Thank you

# Astro

Answer 2

let the initial bacteria =a

1st hour---

total bacteria=108a/100=1.08a

2nd hour--

total bacteria = 92x(1.08a)/100=0.92x1.08a

3rd hour--

total bacteria= (107/100)x 0.92x1.08a

which equals 12170

so,    1.07x0.92x1.08a=12170

 a=11417.093

Thank you

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