If You Buy a Blouse at Random from the Sands

Essay

If you buy a blouse at random from the Sands End catalog, P(blue blouse) = 0.3 and P(frilly sleeves) = 0.2.
A) Find P(blue blouse or frilly sleeves). Show your work for credit.
B) What assumption did you make in part A? Justify your assumption for this situation.