Tower #5

Level 1, cost = 5000 crystals, yield = 3.24%

Level 2, cost = 7500 crystals, yield = 3.29%

Level 3, cost = 11250 crystals, yield = 3.33%

Level 4, cost = 17000 crystals, yield = 3.36%

Level 5, cost = 25500 crystals, yield = 3.40%

Level 6, cost = 38250 crystals, yield = 3.45%