Develop a function trayful$-$total. The function consumes a trayful

and produces the total cost of all the goodies on it $($a number$).$ When calculating the total

cost$,$ you must take into account the number$-$ordered of each goodie ordered.

$9.(30$ Points$)$ Develop a function called goat$-$cheese$-$promo. The function

consumes a trayful and a number representing the discount on goat cheese items $($in

decimal form$).$ The function produces the total cost of the trayful $($as above$),$ with the

discount applied to goat cheese classified goodies $($and only goat cheese goodies$).$

Example: a $15\%$ discount is entered as $0\mathrm{.}15,$ so a serving of "pink peppercorn" goat

cheese that usually sells for $$3$ but is discounted by $15\%$ gets reduced by $$0\mathrm{.}45$ to $$2\mathrm{.}55.$