On a certain day, the exchange rate was 60 U. S. dollars for 50 euro. How many U. S. dollars were 60 euro worth that day?

The exchange rate can be expressed as: 60 dollars / 50 euro

So 60 euros * 60 dollars / 50 euro = 60 * 60 / 50 dollars (the euros cancel out)

= 3600 / 50 dollars

= 360 / 5 dollars

= 72 dollars