Answer:
a. Performance must be 99.9% of what was promised and no less.
Step-by-step explanation:
If performance was 99.9% of what was promised, then it was basically fully performed. It is like saying I will finish this in 1 hour, but it took me 1 hour and 1 second to finish.
Substantial performance allows a party to receive payment even if they didn't fully complete the specific terms of a contract. In some states, a % is used to measure substantial performance and it ranges from 2-3% of costs remaining to fully complete a contract.
The substantial performance doctrine basically allows a small deficit on either party involved in a contract. It depends a lot on the good faith that the parties had on completing the work.