If C dollars are deposited in an account paying r percent annual interest, approximate the amount in the account after X years if c=$250, r=2.4% and x=23 years?
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Assuming simple interest, the formula is c+cxr/100=c(1+xr/100) for the accumulated amount plus interest. Plugging in the values given: 250(1+23*0.024)=$388.

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