$15 \times 40$\%=$6$,  She ate $6$ slices. 
Bella and her brother agreed to share a pizza which was cut into $15$ slices. Bella ate $40$\% of the pizza. How many slices did she eat? 
(1) $$4$$ 
(2) $$6$$ 
(3) $$9$$ 
(4) $$11$$ 