you gotta add some words into it.. so you need 67,316 green dhide bodies. thats 201,948 green dhides. you're buying at 1,500ea so it'll cost 302,922,000. high alch of green dhides bodies is 4,680 and according to your calculations you're getting nats at 70ea so you'll need to spend 302,922,000 + 67,316*70 = 307,634,120 and you'll get 4,680*67,316 = 315,038,880 which means you'll get an overall profit of 7,404,760. yup, profit cos your cost per body (1500*3+70= 1570) is less than the high alch value (4680) anyway, you forgot to add in the 20gp cost in tanning at alkharid (canifis is nearer and cost more). furthermore green dhides are hard to get at 1500 ea. AND nats at 70ea? i assume you're crafting them yourself here. BUT if you sold them at 300ea instead of using them for this, you'll be actually losing 120gp per green dhide body here.