Making Teak plank (Plank Make + Sawmill voucher)

Making Teak plank (Plank Make + Sawmill voucher) in OSRS: 1 × Teak logs, 1 × Nature rune, 2 × Astral rune, 15 × Earth rune, 1 × Sawmill voucher + 350 coins → 2 × Teak plank. Profit right now: -2,389 gp after GE tax (input cost 3,849 gp).