While the term proof stuck, in America, the standard it refers to has nothing to do with gunpowder. Around 1848, 50% alcohol by volume was chosen as a baseline and 100 was used as its corresponding proof. Thus, the proof is double the ABV. In other countries, other proof systems are used. For example, in 1816 the U.K. started to use gravity as their standard.
Cost for rental will vary. Generic albuterol nebulizer solutions cost about $.40 for 10 doses and brand name versions can cost up to $12.10 for 10 doses, according to an analysis of national average sales prices by the Office of the Inspector General in the U.S. Department of Health and Human Services.
The Fertilizer Cost Calculator is an Excel based calculator which will help you evaluate the cost of applying varying levels of fertilizer and using various products. The Calculator should be used as a tool (along with a soil test) to evaluate estimated costs per acre for fertilizer. Price per ton for Urea, Ammonium Nitrate, DAP and Muriate of Potash. 2  Application rate per acre of (N,P2O5, and K2O) - example (60-30-30 or 60-0-30). 3  Application costs per acre ($/acre) - this may be a charge/acre to be truck spread, or a buggy rental fee prorated on a per acre basis.