Please help me. Thank you!

Explain what consideration is and why it is a requirement for a valid contract. Prince hired Jank to remove asbestos from a warehouse that Prince was expanding. The written contract provided a fee of $3,500 payable to Jank upon "completion as certified by the architect." Jank had estimated that the project would take three weeks. Jank was not aware that the state required special breathing gear, which was more costly than that mandated by local building authorities. Because of this, Jank incurred unforeseen costs of $575. Jank Must perform for the agreed price. Can reform the contract under the UCC. Can void the contract because of the price increase. Can demand the additional $575 be paid by Prince