On July 14, Emerson Corp

On July 14, Emerson Corp. entered into a written agreement to sell to Thomas Corp. 120 cartons of pencils at $4 per carton total price of $480), delivery within 30 days. The agreement contained no other terms. On July 15, Emerson Corp. and Thomas Corp. orally agreed to modify their July 14 agreement so that the new quantity specified was 150 cartons total price of $600), same price and delivery terms. The modification is unenforceable for lack of consideration.