Beginner 'Formula' - Puzzles

I was solving tactics on chesstempo.com as beginners are advised to do, and noticed that my 'correct' answer percentage * 18 approximately equals the rating I'd expect if I were to play in a tournament (never going to happen, methinks). 

For example, 75% success rate ~ 1350 rating. I got some problems wrong (sleepy) and then, bam! 60% ~1080.

Ofcourse, most won't drop below 50% threshold, but 'absurd' ratings are still possible.

Just curious, can anyone who has done a lot of problems share what 'rating' they're getting :D

I had accumulated chess rating here on chess.com based on how much time left when solving it. I also get low points when I does have a 60-100% success rate.