You should have agreed on a price before starting the job. After the fact pricing rarely goes well.
The post is also too vague to address a price point.
Who paid for the materials? Who picked up the materials? How good a job did you do?
Ron

Generally when a job is completed we expect to be compensated for the full amount specified in the original bid.

When attempting to determine a price after the fact ask yourself..what was your bid? If you bid "0" then any amount greater than "0" would be a gratuity.