Boris Milkem owns six assets that he must sell over the next three years. He expects that the sales will generate the following revenue, in millions of $
|Year 1||Year 2||Year 3|
For example, if he sells asset 3 in year 2, he receives $30 million. Each asset can be sold at most once, of course. He must sell at least $20 million of assets in year 1, $30 million in year 2, and $35 million in year 3.
How can he maximize his total revenue from the sales?