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List the two principal types of cells of the immune system,and describe their functions.
Payback Period
The time it takes for an investment to generate enough revenue to recover the original cost.
Annuity
An investment product offering a regular payout to a beneficiary, commonly employed to generate a steady income for those who are retired.
Net Cash Inflow
The difference between all cash receipts and all cash payments over a period of time, showing the net increase or decrease in cash.
Time Value of Money Concept
The principle that money available now is worth more than the same amount in the future due to its potential earning capacity.
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