a^0=1   als   a0

a^-n = 1/a^n

a^r×a^s = a^s+r

a^r/a^s = a^s-r

(a^s)^r = a^s×r

(ab)^r = a^r×b^r

(a/b)^r = a^r/b^r = a^r×b^-r

(a+b)^r  a^r+b^r

 

A quantity K which increases by p% per year will have increased after t years to:  K(1+p/100)^t

A quantity K which decreases by p% per year will have decreased after t years to: K(1-p/100)^t

What you should have deposited t years ago in order to have $P today: P(1+p/100)^-t   or   P/((1+p/100)^t)

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