Try to do a task while on the way to completing another one. Jill can only carry one cake at a time but she can collect money, tune the television, hand out menus, bake another cake and frost cakes--all while holding a cake in her hand. For example try the following.
-When a cake is done baking, start baking the next customer's order before the first cake is taken to be frosted. -Hand out menus to the new customers while going to pick up cakes from the oven.
If you can't view the shapes of the cakes because of how they are stacked, look at the color on the side to determine its shape. Choose a tray with the frosting color you need. After that, build your cake on top of one tray to avoid confusion about how the cakes are stacked.