This may be too impossible a question to answer but here it is anyway, the number of cannonballs do I want for 87-99 Slayer? I realize this is actually hard, so even an estimate to the nearest 25 or even 50K will be great. I'd like to locate this out as I want to pre-buy all of my cannonballs, since I have come to the conclusion it will save me a lot in the long run.
Please don't take this as an effort to control prices, but it's my view that c balls could rise in the coming months, increasing the cost of 99 slayer for me. When you look at long term charts, c all balls are currently at one of the lowest point for several months. I recognize part of reason for the drop in c all ball prices was the effigy nerf, but I feel the return of robots drove costs down further. I am also doing this because, I did it in the past and it paid off. Whenever I heard about the initial bot nuke, I immediately panic bought 99 tried and herb and saved millions.
In that case, you're making an investment which really should not have anything to do with how many cballs you need for slaying. It is like how people feel that mining ore, banking it, then smithing it's coaching 2 skills at once with better efficacy - unless doing both together somehow saves more time and money compared to doing the two individually (e.g. if there's a furnace on the way to the bank which saves you the time of having to run to a furnace after banking), they should be treated as two individual events.
Since the advent of the grand exchange, items can be exchanged for money with ease, and may effectively be considered the exact same thing. Say that (hypothetically) you need 100k cannonballs for slayer and can afford 200k, at 250gp each. If you purchase 25000k 100k cannonballs and they climb to 300gp each, then you effectively have 30000k, which you may convert to cash or use. Likewise, in the event the cannonballs instead fall into 200gp every day, you will effectively have 20000k, which you can convert to cash or use.
Doubling the investment simply doubles the yield, if it be negative or positive. If you believe cannonballs will rise, then invest as much money as you need into them: the greater the investment, the higher the potential profit on whatever you don't wind up using. If you end up buying fewer cannonballs than you need, then should they rise you'll have to cover the rest at a greater cost.
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