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Engineering Economy (Quiz #1)
Interest
7
Engineering
Undergraduate 3
01/30/2012

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Term
Interest is...
Definition
The manifestation of the time value of money.
Term
Interest is...
Definition
Rent for money borrowed.
Term
Interest is...
Definition
Earned when a person or organization saves, invests or lends money & obtains a return of a larger amount.
Term
Formula for Interest
Definition
(End amount) - (Original Amount) as a Percent(%)
Term
Formula for Interest Rate
or
Rate of Return
or
Return on Investment
Definition
[(Interest accrued per time unit)/(Original Amount)] * 100%
Term
An employee @ Laserkinetics can borrow $10,000 on May 1st & must repay a total of $10,700 exactly 1 yr later. Determine the interest amount and the interest rate paid.
Definition
($10,700) - ($10,000) = $700

Manipulating the equation...

% = ($700)/($10,000)
Term
Calculate the amount deposited 1yr ago to have $1000 now @ an interest rate of 5%. Also calculate the amount of interest earned during this time period.
Definition
$1000 = x + x(0.05) = x(1 +0.05) = 1.05x

x = (1000)/(1.05) = 952.38

I = $1000 - 952.38
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