How are these two amino acids attached? 
Definitions:
Population
The total number of people inhabiting a particular area or country.
Replacement Rate
In the context of benefits or salaries, it refers to the percentage of a worker's pre-retirement income that is paid out by a pension program upon retirement.
Present Value
Present value is the current worth of a future sum of money or stream of cash flows, given a specified rate of return.
Future Value
The amount to which some current amount of money will grow if interest earned on the amount is left to compound over time.
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