Backing out of a real estate deal

[Tyler Keepers]

Need some help/advice.  Im under contract  to buy my first rental property.  It’s a duplex monthly total rents are $1250. Insurance/taxes $150 vacancy (10%) $125, 

Maintenance (10%) $125 
water/sewer $100

Prop manager (10%) $125

Loan payment $400 

Cash flow about 15% ROI or $225.
what I didn’t factor in was the cost of capital expenditures... which I estimate now to be about $200. Leaves me with only $25 of cash flow.  What should I do? Should I just walk away and lose my $1,000 of earnest money? I still have a finance contingency left... Thanks for help in advance