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A = P(1 + rt) is used to find the principal amount P deposited, earning r% interest, for t years. Use this to find what principal amount P David invested at a 5% rate for 12 yr if A = 7,000.

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huh? so plug in your numbers!
P(1+.08*12) = 7000

but typo .05

read twice before posting!
Thanks, Damon.

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