Tower #1

Level 1, cost = 50 crystals, yield = 1.92%

Level 2, cost = 75 crystals, yield = 2.52%

Level 3, cost = 112 crystals, yield = 2.53%

Level 4, cost = 170 crystals, yield = 2.54%

Level 5, cost = 255 crystals, yield = 2.634%

Level 6, cost = 382 crystals, yield = 2.638%