Answer and Explanation:
The computation is shown below;
a. the net present value is
Year  cash flow     factor at 10%   Discounted cash flows
0 Â Â Â Â -$56,000 Â Â Â Â 1 Â Â Â Â Â Â Â Â Â Â Â Â $56,000
1 Â Â Â Â Â $23,000 Â Â Â Â 0.9091 Â Â Â Â Â Â Â $20,909.09
2 Â Â Â Â $23,000 Â Â Â Â Â 0.8264 Â Â Â Â Â Â Â $19,008.26
3 Â Â Â Â $25,000 Â Â Â Â 0.7513 Â Â Â Â Â Â Â Â $18,782.87
4 Â Â Â Â $28,000 Â Â Â Â 0.6830 Â Â Â Â Â Â Â $19,124.38
5 Â Â Â Â $16,000 Â Â Â Â Â 0.6209 Â Â Â Â Â Â Â $9,934
Net present value                $31,759.34
b. The internal rate of return is
Here we apply the formula
= IRR()
After this, the irr is 30.75%