Answer
$250$
Work Step by Step
Divide total number of chickens raised for food in a year in the U.S with number of seconds in a year.
Number of chickens raised for food in a year is 8 billion= $8\times10^{9}.$
$\frac{8\times10^{9}}{3.2\times10^{7}}=(\frac{8}{3.2})\times(\frac{10^{9}}{10^{7}})=2.5\times10^{2}=2.5\times100=250$
