help on math!!!!!!!!!!!!!

Question

A lottery has a grand prize of $20,000, two runner-up prizes of $2,000 each, ten third-place prizes of $400 each, and twenty consolation prizes of $40 each. If 40,000 tickets are sold for $1 each and the probability of any one ticket winning is the same as that of any other ticket winning, find the expected return on a $1 ticket. (Round your answer to two decimal places.)

Answer 1

Probability of each ticket of winning is: (1/40000)

Expected return is:

(20000 + 2*2000 + 10*400 + 20*40)*(1/40000) = ?

Formula is:

the sum of (x-value * its probability)