Ernie enters into a K to excavate Bert's property. The price quoted was based upon soil core samples provided to Ernie by Bert. The soil core samples did not, however, accurately reflect the condition of the soil. The soil was muddy and a concrete slab necessitating blasting was found on the property. Ernie informs Bert that he can only complete the job if paid an additional $5000. Bert agrees. Is K2 supported by consideration