$0.40? As in 40 US dollar-cents? As far as I know, it's much lower than that, around $0.005 (probably lower now, Bitcoin has dropped since then)
https://github.com/bitcoin/bitcoin/pull/3305
"The new fee after this patch is 0.5 cents."
https://github.com/bitcoin/bitcoin/pull/3305
"The new fee after this patch is 0.5 cents."
I'm guessing y-axis is cents. Looks like it's about $0.25 - $0.30 these days.