Answer:
there are no cash flows given, so I will use another question as an example:
NCF year 0 = -$1,150,000
NCF year 1 = $275,000
NCF year 2 = $275,000
NCF year 3 = $275,000
NCF year 4 = $275,000
NCF year 5 = $275,000
NCF year 6 = $275,000
NCF year 7 = $275,000
a) when cash flows are the same for all the years, you can use an ordinary annuity factor:
PV = $275,000 x 4.86842 (PV annuity factor, 10%, 7 periods) = $1,338,815.50
NPV = -$1,150,000 + $1,338,815.50 = $188,815.50
b) PV = $275,000 x 3.81153 (PV annuity factor, 18%, 7 periods) = $1,048,170.75
NPV = -$1,150,000 + $1,048,170.75 = -$101,829.25
c) PV = $275,000 x 3.24232 (PV annuity factor, 18%, 7 periods) = $891,638
NPV = -$1,150,000 + $891,638 = -$258,362
If the cash flows are different, then you must discount each cash flow individually.
E.g. NCF year 0 = -$150,000
NCF year 1 = $75,000
NCF year 2 = $85,000
NCF year 3 = $95,000
NPV = -$150,000 + $75,000/1.1 + $85,000/1.1² + $95,000/1.1³ = $59,804.66