What to check before signing anything, and what can wait.
Most people meet this once and never think about it again, which is exactly why it is worth reading up on.
Where to go from here
Nobody is required to explain this to you, which is half the problem. The exceptions matter more than the rule, and there are three of them.
What to check first
The exceptions matter more than the rule, and there are three of them. There is a deadline involved, and missing it costs more than the difference.
What it costs
The exceptions matter more than the rule, and there are three of them. The practical effect is easier to see in a single example than in a summary.
The short answer: check the date, then check the figure, then decide.