How does one determine what the appropriate premium is for an insurance policy? I don't understand how to start the below question from my study guide

Suppose Craig gets 30 dollars tomorrow if he is employed and 0 dollars if he is laid off. Craig is risk averse and has utility function U(x) = x. Craig's exploitative friend Jenny is risk neutral and offers Craig insurance. Jenny makes the following take it or leave it offer to Craig: she asks him to pay a premium P in the case he is employed, and in exchange offers benefit B if Craig gets laid off. The commonly known probability of Craig being laid off is p (0, 1).