A person with natural logarithmic utility (ln function) u(x) = ln(x) has current net wealth of $50 and is also given a lottery ticket that pays $20 20% of the time and $0 80% of the time. What is the minimum price this person would accept to sell their lottery ticket?

$0, this person hates risk of any kind and will be happy to rid themselves of the uncertainty

$1.82

$3.71

$4.00

$4.64

(The answer is $3.71, I just need to know how to get there)