Suppose that Emily's utility function is U(W) = W ^0.5, where W is wealth. She has an initial wealth of $100. How much of a risk premium would she want to participate in a gamble that has a 50% probability of raising her wealth to $120 and a 50% probability of lowering her wealth to $75?

a) Mary's risk premium is $______enter your response here. (Enter your response rounded to two decimal places.)