An antimicrobial chemical was added to a population of bacteria. The initial population was 107 living cells (10,000,000). After 2 minutes, only 106 cells still remained alive. After another 2 minutes (4 minutes of total treatment), about how many cells would still be alive?Group of answer choices

Explanation:

As given here, the initial population of bacteria was 10⁷( 10,000,000).

After the addition of antimicrobial chemical, the population of bacteria decreases at the rate of 90% of the total bacteria per 2 minutes,

So  after 2 minutes the remaining bacteria is 10,000,000- 9,000,000= 1000,000( 10⁶)

So as in question,  after next 2 minutes.

90% of this will die , so only 10% will remain= 1,000,000-900,000= 100,000

So After two minutes( total 4 minutes)  the remaining bacteria is= 10⁵ (100,000)