Math:
300 000 spent on supplies.
Around 500 green d hides can be tanned every 15 mins.
Buy green d hide at med, Which would cost 1698 ea. Which will get you about 177 which you can do in like 2 mins. You sell the green d hide back for 1850 ea, A little below med price. Which is 327 000 thats 27 000 in 2 mins!.
Ok here comes the big bucks. Once you have 3 396 000 gp buy 1998 green d hide tan them and sell back for 3 700 000 guess how much cash that is an hour.
3 396 000 - 3 700 000= 304 000
Wow thats 304 000 an hour! Well done.! I use this way alot if you did this for 2 hours a day thats 608 000 a day for 1 week and u'll have 4 256 000 a week.
In 1 month thats about 18.8 m around the same amount as rcing until your lvl 91 rcing. Hope this helps since it takes no skill. I would say this is better then rcing, since theirs no revants or any abysal creatures. Plus you need no requirements except the cash to spend.
Warning:
Please remember to have about 45 k left over to tan 2 k green d hide in 1 hour. And remember to have varrock tele tabs and ring of dueling ( its not necarily but it makes it go faster.
Say thank you if you think this is a good gudie by.

