Rusty Industries has decided to save $$50,000$ a year for two years and then increase that amount to

$$80,000$ for an additional three years. Which one of these formulas will correctly compute the future value

of these savings as of Year $5$ at a rate of $7$ percent?

$FV{A}_5=[$$$50,000\frac{{1\mathrm{.}07}^5-1}{0\mathrm{.}07}]+[$$$30,000\frac{{1\mathrm{.}07}^3-1}{0\mathrm{.}07}]$

$F{V}_5=($$$50,000{1\mathrm{.}07}^5)+($$$30,000{1\mathrm{.}07}^3)$

$[$$$80,000\frac{{1\mathrm{.}07}^3-1}{0\mathrm{.}07}\}$

$FV{A}_5=[$$$80,000\frac{{1\mathrm{.}07}^5-1}{0\mathrm{.}07}]+[-$$$30,000\frac{{1\mathrm{.}07}^2-1}{0\mathrm{.}07}]$