1500 Rupees Per single
1250 Per track (if EP (<7 tracks))
1000 Per track (if Album (>7 tracks))
Normally, every 100 Rupees seems to be about $1 in USD. I think it used to be less tho, not sure.
Extra note: it used to be 600 Rupees, at times 400 Rupees and also many times just free favor mixes...