Add 21 mA and 
and express the result in milliamperes.
Definitions:
Present Discounted Value
The current worth of a future sum of money or stream of cash flows given a specified rate of return, used in discounting to calculate the present value of future earnings or obligations.
Future Income
Expected earnings or revenue that an individual or business anticipates receiving in the future.
Interest Rate
The percentage charged on the total amount of borrowed money or paid on saved or invested capital.
Interest Rate
The part of a loan that is taken as interest from the borrower, customarily presented as an annual percentage of the still unpaid loan.
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