CFA4Techie

it is not solely the size of the outlay
you may calc if you wish:
for A): -
NPV = -1.0 + 1.0/(1+x) + (-0.1)/(1+x)^2
Let NPV = 0 we get IRR.
so we need to solve this Quadratic Equation.
for y=ax^2+bx+c
we have x1=(1/2a)*(-b +(b^2-4ac)^0.5) AND x2=(1/2a)*(-b -(b^2-4ac)^0.5)
just solve it. if you get two different but meaningful X , that is multiple IRR