2-Gnagey's Alpaca Sock Partnership (GASP) wants to know who its receiving its spam emails. Based on tracking, GASP knows that 40% of its website visitors are under 21 and 60% are 21 and over.

GASP's spam was sent out to its website visitors, but based on prior research the under 21 website visitors have better spam filters, and the spam will only reach 15% of those under 21. However, the spam email will reach 45% of those 21 and over.

Given that a website visitor received a spam email, what is the probability they are under 21?

(Round to two decimal places, e.g. 0.57)