Laila is playing a game where there are 4 blue markers and 6 red markers in a box. She is going to pick 3 markers, and replace each marker immediately after she picks it.
If she picks all 3 red markers, she will win a total of $400. If the first 2 markers she picks are blue, she will
win a total of $300. Under any other outcome, she will win $0.
What is the expected value of Laila's winnings?
Round your answer to the nearest cent.

answer: the answer is one of

step-by-step explanation:   we are given to write a proper fraction where the whole is divided into an even number of equal parts less than ten, and an odd number of those parts exist.

an even number less than 10 may be one of 2, 4, 6 or 8. so, the whole may be one of these four evens.

now, an odd number of these parts must exist, so the numerator must be an odd number, one of 1, 3, 5 or 7. it cannot be 9 because then the fraction will become improper.

thus, our fraction may be one of the following