Answer
28% of shoppers are seniors in the New Orleans Crescent City Farmers Market.
Work Step by Step
We need to convert "896 out of 3200" to a percent. We do this by dividing (with a calculator):
$\displaystyle \frac{896}{3200}=0.28=28\%$
Thus 28% of shoppers are seniors in the New Orleans Crescent City Farmers Market.