Look up a magic calculator, then how many times you have to plank-make from 86-99 magic, then add the prices of the planks + runes to cast the spell together, to get the cost.
There is no magic planks in runescape. Only plank, oak plank, teak plank and mahogany plank.
depends on inventory and training
In RuneScape, plank running is when you bring logs to a sawmill to convert into planks. This is rather profitable due to the expensive cost of planks and their heavy demand by players training construction.
You can't, it does cost money. Whoever wrote that is right, but if you have level 86 magic, completed Lunar Diplomacy and Dream Mentor, you can cast the spell Plank Make. It requires 2 astral runes, 1 Nature, and 15 Earth Runes. If you use a Earth Staff, the cost of the spell is about 486 coins. Without the staff, it's 651. But, with it planks are a little cheaper than getting them converted at the sawmill. A normal plank costs 70 to make instead of 100. An oak plank costs 175 to make instead of 250. A teak plank costs 350 instead of 500. A mahongany plank costs 1,050 instead of 1,500. It's also good magic experience, giving you 90 xp per cast. Hope that helped a bit.
The magic tree seed costs around 300,000 coins. Search the item on the Grand Exchange to get the current price.
That would depend on the thickness of the plank. It would also vary, depending on the type of wood, and where you buy it (what country, for instance).
The cheapest way to makeoak planks are to chop the oaks yourself and take them to the sawmill. You may also send servants to the sawmill to convert them into planks which is more expensive; Also the Plank Make spell from the Lunar spellbook may be use by players who have completed the Lunar Diplomacy and Dream Mentor quests, and have level 86 Magic. The plank make spell is the quickest way to make planks but the cost of the runes is high.
Bump
no
The price changes everyday for pretty much every item in runescape. So by the time I would tell you the price would probably be different.
an Ancient Staff on RuneScape costs 417k as of September.
Prices change constantly, i would say 20k-30k.