An investment costing $$25$ returns $$27\mathrm{.}50$ at the end of one year with no risk. Given this, you know that the NPV:equals $1\mathrm{.}0$ if the required return is $10$ percent$\mathrm{.}5$ zero it the required rate of returns me percent must be positive at any given discount rate.is zero at any given discount rate.is negative if the required return is less than $10$ percent.