When the current U.S. income tax system was instituted in 1913, the rate on the highest tax bracket was _____

The joining of the eastern and western sections of nation's first transcontinental railroad was commemorated with the driving of the last spike on May 10, 1869:

a. in Salt Lake City. b. in Washington, D.C. c. at Promontory Point. d. on the rim of the Grand Canyon.

The price per unit times the total quantity sold is

A) average revenue. B) marginal revenue. C) total revenue. D) price revenue.