Bloggarithm

Why don't they provide every student with a bulletproof vest which may cost about 500$(www.securityprousa.com) per vest? The total number of school children in the USA is 50.7million(https://nces.ed.gov/fastfacts/display.asp?id=372) as of 2017.  So, the total budget for this would be = 5,07,00,000*500 which is $25.35bn.  This amount is 0.61% of their 2018 federal budget.  This is exactly equal to the amount sought by white house for Trump's pet project(U know what is that!). 

It's the amount of energy extracted from the air-conditioned space by a certain AC. 1 Ton in SI units is = 210 KJ/min or 3.5 KW In earlier days, people used ice blocks for colling space. They coined a standard measurement term for this cooling effect along with a time factor to make it easier. So, a ton of refrigeration is the amount of heat absorbed by a ton of ice at 0-degree Celsius to get converted into water in 24 hours.