Amicrowave oven is on sale for 20% off the regular price .the sale price is $250.00. what is the regular price of the microwave oven?
a 166.67
b 200.00
c 300.00
d 312.50

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15