A bacteria culture starts with 80 bacteria and after 2.5 hours the population consists of 140 bacteria. What is the rate of increase?

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Answer 1

First  find the difference between the beginning number and the  ending number

 

 

140-80=60

 

 

Divide  the increase amt by the beginning number   = 60/80   .75

 

 

Convert to percentage  -Multiply by 100

 

.75 x 100 =75%