check my deal please

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small home in a great location the newer homes are like 400-700k but small older homes go between 250-299k but it needs alot of work kicthen bath floors roof mechanicals,and paint= 20k but the mechannicals and bath i can do plus some other things. so i took the low end 250k x 70% 175000- 20k = 155000. but this is a mls asking 225k saying flip this house i made the offer. waiting a counter do i have any wiggle room to come up?

thanks travis