Question about logs... View the picture attached and please provide a solution to part B.

I tried to solve part b by using the value of loudness for loud snore from part a. Using the value, I found the intensity of the loud snore. And then used that intensity in a ratio with the less intense snore, and made the ratio equal to 316. From that I got the intensity for the less intense snore. I plugged that intensity into the formula given in the question to find the loudness in decibels, but still couldn't get the correct answer, which is 44dB. Could you please provide me with a solution for this?
The value for I0 is 1.0x10^-12