Jenny plans to have two children but doesn't know if they will be boy-boy, girl-girl, or boy-girl. what is the probability that she will have two boys?
0.5
0.25
0.75
1.00

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.