The question below is from a BUS2016H tut.

I'm struggling with both a) and b).

For a), I get that $$PV=0+V+4V^2+...+361V^{20}$$

But I don't know how to simplify it from there. I know it's an increasing annuity but I'm not sure how to get it into any form I can recognize.

And I'm completely unsure where to begin for b).

Ah right, misread the question. Thanks very much!

Would it be a similar idea for b) i.e. manipulate into something of a similar form to that in a)?