Internal Rate of Return

Hi Mr. John
I find this question quite tricky. I understand the definition of IRR is the rate at which NPV is zero and I understand the calculation in this question but I do not arrive at zero if you know what I mean. Please be kind enough and explain this question to me detail.

A machine has an investment cost of $60,000 at time 0. The present values (at time 0) of the expected net cash inflows from the machine over its useful life are:

Discount rate Present value of cash inflows
10% $64,600
15% $58,200
20% $52,100

What is the internal rate of return (IRR) of the machine investment?

A Below 10%
B Between 10% and 15%
C Between 15% and 20%
D Over 20%