hello guys

i have been reading a book calledprobability demystifiedwritten by

a. g. bluman, the answer he gives to the following question has me

mystified!!!! here is the question and his answer

One thousand tickets are sold for $2 each and there are four

prizes. They are $500, $250, $100, and $50. Find the expected value

if a person purchases 2 tickets

his answer

= -$0.20 cents

his answer does not add up to me ,

i think it a mistake can any1 help?

tx