On March 31, 2018, M. Belotti purchased the right to remove gravel from an old rock quarry. The gravel is to be sold as roadbed for highway construction. The cost of the quarry rights was $228,000, with estimated salable rock of 30,000 tons. During 2018, Belotti loaded and sold 5,700 tons of rock and estimated that 24,300 tons remained at December 31, 2018. At January 1, 2019, Belotti estimated that 11,400 tons still remained. During 2019, Belotti loaded and sold 17,100 tons. Belotti uses the units-of-production method. Belotti would record depletion in 2018 of: