I thought maybe she might have been a little to vigorous with her 7th grade answer so I did the math in a way she could explain and . . . well, the way I would teach it to her instructors and classmates:
1933 was the last year a $10 Indian Head gold coin was minted into circulation. It had about .48375 troy oz of gold or put another way you could get .48375 troy oz of gold for $10. On 1/13/15 you can buy .48375 troy oz gold valued at around $595.10.
The Inflation math goes like this, $10/$595.1= $0.0168 or today's dollar is now worth $0.0168 compared to the 1933 dollar based on the price of gold or an inflation induced decrease in the value of the dollar of over 98%! Gold not becoming more valuable but the dollar worth-less.
Here is the good part . . . wait for it . . .
U. S. Dollar value = 1.68 cents
Copper cent value = 1.78 cents based on 1/13/15 price of copper (and other metal,) making a copper penny now more valuable than the dollar.
