Problems figuring out the depreciation of an automobile

I am trying to make sure I have the appropriate info filled out in my forms. On my Form 3885A (Alternative Minimum Tax Depreciation Report) I have my car and it includes the date in service, which was September of 2017, but there is no price mentioned in the "Cost."

Is that a mistake? Should I put the original amount that I paid for the car when buying in 2017? Then figure out the depreciation from there? I think I must have done something wrong last year, but if I can get more deductions from the use of my car I would like to be sure to do this correctly. 

 

Thanks for any help.