I'm not sure your maths is correct. By your logic 9.3 would be more like 83.7%.I also thought it was quite funny to use a decimal number on a scale from 1 to 10, not johnymax.
Especially because it doesn't correspond to 93 %, given that 1 is 0 %, and 10 is 100 %, so it's more like 92%. I'm not sure whether he factored that in.
And I'm not being sarcastic here lol