On january 1, 2020, an entity purchased a mineral mine for 26,400,000 with removable ore estimated at 1,200,000 tons. During 2020, the entity incurred 2,000,000 exploration cost and 1,600,000 development cost related to drilling of wells. The entity removed 80,000 tons of ore and sold 60,000 tons of ore in 2020

What is the Depletion rate per unit?

1. 23.67

2. 23.33

3. 22

4. 25