Really cannonballs =200gp coal = 200gp iron = 100 gp 4*200=800-300=500*9=4500gp Around 2 minutes a trip 30 trips an hour = 30*4500=135000*84 hours maybe a week of 12 hours each day on comp.= 11340000 So you could make 11m in one week plus 580608 smithing xp and the prices were rounded other than that GWD Chins