Solve the initial-value problem. 
Definitions:
Purchasing Power
The value of a currency expressed in terms of the amount of goods or services that one unit of money can buy.
Real Cost
The total cost of producing a good or service, including both the monetary and opportunity costs.
NBA Basketball Game
A professional basketball contest between teams of the National Basketball Association.
CPI (Consumer Price Index)
A measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food, and medical care.
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