In 1950, the average price of a car was about $2000. This may sound inexpensive, but the average income in 1950 was much less than it is now. To compare dollar amounts over time, use the formula V= a/s(C). Where A is the old dollar amount, S is the starting year's Consumer Price Index (CPI), C is the converting year's CPI, and V is the current value. How can you rearrange the formula to find the old dollar amount?