added comment for slicesPerPerson.

Added part 2 of the Slices of pie problem.
tested equations with provided examples.
output displays correct.
removed secondary variables definitions.

changed first declarations to test with different combinations

test successful.
Added the average shopping bill problem.

Started with the array to make sure it displayed correctly.
Added equation to compile the total bill over all.
Edited console.log so i could view calculations.
added weeklyAvg variable.
Edited console.log to view weeklyAvg.
Edited console.log to display instructed information now that testing is done.
Added comments and moved comments so they were closer to statements they explain.