I need help with this. I calculated it adding ctf, CTR and 1-t where applicable. Am I doing it right? Please help solve

ENGG 820, March, 2024 4. A capital investment of $150,000 is made for a device (CCA Class 6). This investment is going to produce following BTCF over the next 8 years. At the end of 8 years, the device is disposed for $20,000. If the marginal tax rate is 32% and the MARR is 10%, what is the after-tax present worth of the investment? (15 pts) Year BTCF $10,000 2 $14,000 3 $18,000 A $22,000 5 $26,000 $30,000 $34,000 8 $38,000