Question

3. A population of bacteria is growing at a rate of 20% per hour. If the population starts at 320, what is it anhour later?(3) 372(1) 360(2) 356(4) 3844. The price of oil, in dollars per barrel, declined last week by 3.5%. If it started the week at $102.00 perbarrel, at what per barrel price did it end the week?(1) $98.43(3) $99.12(2) $98.50(4) $100.56

Answer 1

Given that the growth rate of the population is 20% .

Since the population starts at 320, the population an hour later will be:

$\begin{gathered} (\frac{20}{100}\text{ }\ast\text{ 320) + 320} \\ =\text{ 64 + 320} \\ =\text{ }384 \end{gathered}$

This means that after an hour, the population will be 384