A U.S. dollar bill is about 0.0043 inches thick. In, 1980, the national debt of the U.S. was about $925 billion. How tall would this be as a stack of $1 bills, to the nearest mile? Hint: A billion is a 1 followed by 9 zeros. A trillion is a 1 followed by 12 zeros. 2 TIMES THE SITES THER INTERS OF A ERTO OFTEN ON 21