You buy a lottery scratcher ticket for $5. The scratcher has 4 possible prizes: There is a 10% chance of winning $5 There is a 7.5% chance of winning $10 There is a 5% chance of winning $20 There is a 2.5% chance of winning $100 If you do not win a prize, then your ticket lost and has no value What is the expected value of buying this ticket? Please round your answer to 2 decimal places. A negative answer means that there is negative expected value, which occurs when your expected winnings are less than the cost of the ticket