how does one generate and calculate revenue 
for many companies revenues are generated from the sales of products or services for this reason revenue is sometimes known as gross sales revenue can also be earned via other sources inventors or entertainers may receive revenue from licensing patents or royalties real estate investors might earn revenue from rental income revenue for federal and local governments would likely be in the form of tax receipts from property or income taxes governments might also earn revenue from the sale of an asset or interest income from a bond charities and non profit organizations usually receive income from donations and grants universities could earn revenue from charging tuition but also from investment gains on their endowment fund 