Tuesday, January 7, 2014

7/1/14 lesson summary

What is interest?
Money paid regularly at a particular rate for the use of money lent, or for delaying the repayment of a debt.

Terms to familiar yourself with:

Principle [P] - The initial sum of money to calculate the interest on, also commonly known as the amount borrowed.

Interest Rate [r] - The percentage of the principle that will be paid as an interest in a certain time period.

Time [t] - Regular-spaced time intervals to collect interest.

Simple Interest Formula: Interest [I] = P x r x t

Compound Interest includes interest on interest already paid or changed.

Compound Interest Formula: I = P(1+(r/100)^t - P

how the formula is derived:

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