Assuming a$1-$year, money market account investment at $5\mathrm{.}39$ percent$($APY$),$ a $3\mathrm{.}90$ percent inflation$$ rate, a $15$ percent marginal tax$$ bracket, and a constant $$$$40$ comma $000$balance$,$ calculate the$$ after$-$tax rate of$$ return, the real rate of$$ return, and the total monetary return. What are the implications of this result for cash management$$ decisions?

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Part $1$

Assuming a$1-$year, money market account investment at $5\mathrm{.}39\%($APY$),$ a $15\%$ marginal tax$$ bracket, and a constant $ $40$ comma $000$balance$,$ the$$ after$-$tax rate of return is

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$3\mathrm{.}98\%.($Round to two decimal$$ places.$)$