3.On August 1, Ernie wrote to Elsie offering to sell Elsie his car for $7,600, and he promised to hold the offer open for ten days. On August 4 Ernie changed his mind; he sent Elsie a letter revoking the offer. On August 5 Elsie e-mailed Ernie, accepting the offer. Ernie's letter of revocation arrived on August 6. Is there a contract? Explain.