Amarketing firm determined that, of 200 households surveyed, 80 used neither brand a nor brand b soap, 60 used only brand a soap, and for every household that used both brands of soap, 3 used only brand b soap. how many of the 200 households surveyed used both brands of soap?

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link :

the correct answer is economics is a game without winners or losers.

unlike sports or games economic is a game without losers or winner rather it is a game where everyone wins. parties of business doing businesses exchange money with each other and hence exchange is done on the basis of goods. one party takes the goods and other sales it so there is winner on both sides. each party values more highly the good it gets than the good it gives up. both sides exchange only because both intend to increase their value. so there is no concept of lose or win.

i would say iii (3) because in order to compare a price you have to use as a reference other near stores because it's its

hope i explained myself