In this paper shows a mathematical modeling with two hypothetical scenarios in which there are savings through a scheme simple annuity and another with the same scheme but including a geometric gradient. In both scenarios the term is one year (n), with periodic deposits of $ 5,000.00 (rp) every 28 days (m) and a nominal interest rate of 1.15% (i) and geometric gradient 5% nominal (Gg) apportioned among 12 deposits. It is expected to know which of the two scenarios represents the best investment.
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