9. for many years in the united states, each bank printed its own currency. the varie
of different bills led to widespread counterfeiting. by the time of the civil war, a
significant fraction of the currency in circulation was counterfeit. if one civil war
soldier had 48 bills, 16 of which were counterfeit, and another soldier had 39 bills.
13 of which were counterfeit, make a conjecture about what fraction of bills were
counterfeit at the time of the civil war.