Answer:
0.47
Step-by-step explanation:
According to the Bureau of Labor Statistics consumer price index, today's prices in 1845 are 97.03% lower than average prices throughout 2019. The dollar experienced an average inflation rate of 2.04% per year during this period, meaning the real value of a dollar decreased.
In other words, $15.90 in 2019 is equivalent in purchasing power to about $0.47 in 1845, a difference of $-15.43 over 174 years.
The 1845 inflation rate was 1.33%. The current inflation rate (2018 to 2019) is now 2.00%1. If this number holds, $15.90 today will be equivalent in buying power to $16.22 next year. The current inflation rate page gives more detail on the latest official inflation rates.