In Washington state Real Estate what percentage of the loan does PMI insure to protect the lender in case the borrower defaults on the loan?

a) the top 30%

B) the top 40%

c) the top 50%

d) the top 60%

all the literature that i've read talks about 20% so its either something i'm missing or it is a trick question. so frustrating. Please explain your thoughts and answers so i can understand. thank you very much!