Sensitivity

Hello, kindly help me with this Open tuition mock question: *Again, please note: my browser froze and I couldn't see the full solution when I submitted/finished.* A project requires an investment of $25,000 and is expected to generate a cash inflow of $8000 a year for 5 years (with the first receipt in one years time). The cost of capital is 10%. What is the sensitivity to change of the cash inflow each year?