Wreathfield, Inc. is choosing between two mutually exclusive projects. The cash flows for the two projects are below. The firm has a cost of capital of 10%, and the risk of the projects is equivalent to the average risk of the firm.
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | |
| Projects A | -12000 | 4000 | 5000 | 6000 | |||
| Projects B | -20000 |
3000 |
3000 | 3000 | 5000 | 8000 | 8000 |
The internal rate of return (IRR) of projects A and B respectively are closest to（ ）。
| 0 | 1 | 2 | 3 | 4 | 5 | |
| Projects A | -$12000 | $4000 | $5000 | $6000 | ||
| Projects B | -$20000 | $3000 | $3000 | $3000 | $5000 | $8000 |
Project A: CF0=12000；CF1=4000；CF2=5000；CF3=6000；CPT→IRR=11.22%.
Project B: same process. IRR=10.5%.