Skinner's Fish Market buys fresh Boston bluefish daily for $$4\mathrm{.}20$ per pound and sells it for $$5\mathrm{.}70$ per pound. At the end of each business day, any remaining bluefish is sold to a producer of cat food for $$2\mathrm{.}40$ per pound. Daily demand can be approximated by a normal distribution with a mean of $80$ pounds and a standard deviation of $10$ pounds. What is the optimal stocking level? $($Round your answer to $1$ decimal place.$)$

Use Table.

Optimal stocking level

lb