Current Chia price is 165 USD. Ceteris paribus you will get 330 USD in 40 weeks.
Also, that setup sounds like it uses a good amount of power. I’d estimate the D2700 with 25 HDDs to use 300W, so if my math doesn’t fail me, over 40 weeks that’s 2000 kWh. If you pay $0.10 per kWh, the electricity costs $200.