EXERCISE $6\mathrm{.}2$

$2.)$ Rosemary Rocksalt is planning to make fancy multi$-$tiered wedding cakes for the next wedding season. To make the cakes, she must invest $$900$ in some special baking pans and tools. To get started, she needs to spend $$1800$ to advertise in the newspaper. She estimates that supplies and materials for each cake will cost $$60.$ She is planning to set the price for each cake at $$499.$ She has the capacitv to make $20$ cakes.

$($a$)$ How many cakes would Rosemary need to make to at least break even?