Making Mahogany plank (Plank Make + Sawmill voucher)

Making Mahogany plank (Plank Make + Sawmill voucher) in OSRS: 1 × Mahogany logs, 1 × Nature rune, 2 × Astral rune, 15 × Earth rune, 1 × Sawmill voucher + 1,050 coins → 2 × Mahogany plank. Profit right now: -770 gp after GE tax (input cost 4,378 gp).