Answer:
Returns
Explanation:
Returns on an investor is the amount of profit or gain an outlay of cash is able to bring at the end of a period.
Rate of returns on invested funds is used as a yardstick by potential investors in deciding which enterprise to fund.
In the given instance where each of the 80 billion pieces of advertising brought 21 cents in revenue, a better replacement for the word revenue is return.
So returns of funds invested on each piece of advertising is 21 cents.
