Final answer:
Usually, a party that substantially performs under a contract is entitled to the full contract price; however, this entitlement may be subject to deductions for incomplete or defective performance. The specifics of the party's contract with Letty Jones and the completed work's quality will ultimately determine if Nelson Roofers receives the full price without deductions.
Step-by-step explanation:
When it comes to contract law, the concept of substantial performance refers to a party fulfilling enough of their contractual obligations that the main purpose of the contract has been met. In cases of substantial performance, the party that has substantially performed is typically entitled to the full contract price, but this entitlement can be subject to deductions for any uncompleted work or defects in the performance of the contract. Whether Nelson Roofers is entitled to the full contract price with no deductions will depend on the specifics of their contract with Letty Jones and the degree of completion and quality of the work performed.