That, of course, depends on the method used. You can go train at Fist of Guthix, and get all the runes you need (for combat during the minigame) free - but I found this to be rather slow. You can do combat with your own runes, in which case it is more expensive. You can do Superheat Item - this will train smithing in the process, and isn't particularly expensive. You might even earn money in some cases. Or you might to High Alchemy; this is a very popular method to gain magic experience. All of these methods have different costs. In any case, it should cost you several millions, unless you use a very slow method.
it has 80 hp
A LOT. :p
for mine you would get about 80 pounds is my estimate.maybe more tho
mine cost $80
cost about 80
That depends on what kind of raw fish you buy.
25% of 80 = 80*(25/100) = 20
$80
$.80
about $80
About 80
80 to 400