484. Einstein on Interest

According to Albert Einstein, Compound Interest is the 8th Wonder of the World. Here is the formula :
A = P(1 + r/q)nq

The nq outside the brackets above does not mean "multiplied by nq" but "to the power of nq".

P is the principal (the money you start with, your first deposit)

r is the annual rate of interest as a decimal (5% means r = 0.05)

n is the number of years you leave it on deposit.

q is the number of times per year that the interest is to be calculated.



Sweet's modern business arithmetic: A treatise on modern and practical methods of arithmetical calculations for the use of business and commercial colleges, ... in other educational institutions