Pricing a bottle of freon at $2,000 in order to pay for the damage it does to the ozone layer when it is eventually released into the environment is an example of adding in:

Last year, western corporation had sales of $5 million, cost of goods sold of $3 million, operating expenses of $175,000 and depreciation of $125,000. the firm received $40,000 in dividend income and paid $200,000 in interest on loans. also, western sold stock during the year, receiving a $40,000 gain on stock owned 6 years, but losing $60,000 on stock owned 4 years. what is the firm's tax liability?

Alarge tank is filled to capacity with 500 gallons of pure water. brine containing 2 pounds of salt per gallon is pumped into the tank at a rate of 5 gal/min. the well-mixed solution is pumped out at the same rate. find the number a(t) of pounds of salt in the tank at time t.

In 2017, "a public university was awarded a federal reimbursement grant" of $18 million to carry out research. of this, $12 million was intended to cover direct costs and $6 million to cover overhead. in a particular year, the university incurred $4 million in allowable direct costs and received $3.4 million from the federal government. it expected to incur the remaining costs and collect the remaining balance in 2018. for 2017 it should recognize revenues from the grant of