Maths problem: how to do (b), thanks.?

(a) ％tage of profits from sales of drinks in Sun Bakery
= (54/360) x 100％ = 15％

(b) From (a), ％tage of profits from sales of drinks in both Bakeries are the same.
But the TOTAL PROFITS (from drinks + bread + cookie + cake) in each bakery  WOULD NOT BE THE SAME.

For eg. :
Suppose total profits in Sun Bakery = ＄10000,
　　　& total profits in Yummy Bakery = ＄20000.
Then, profits from sales of drinks in Sun Bakery = 10000 x15％ =＄1500
& profits from sales of drinks in  Yummy Bakery = 20000 x15％ =＄3000

∴ the profits from sales of drinks in the 2 bakeries are not the same
(unless they have exactly the same total profit, which is quite impossible)

Thus, l don't agree with Emily's claim.

~~~~~~~~~~~~~~~~~~~~~~~ The End ~~~~~~~~~~~~~~~~~~~~~~~~~
NOTE:-
=====
％tage of profits in the 2 bakeries ---- THE SAME
profits in the 2 bakeries ---- NOT THE SAME

要簡單一點, 那 eg. 可省略！