Monsanto Co (MON.N) will pay $80 million to settle civil accounting violations after it allegedly misstated its earnings in connection with its top-selling Roundup product, U.S. securities regulators said on Tuesday. The Securities and Exchange Commission also said that three accounting and sales executives have also agreed to settle charges in connection with the case. The SEC’s case against the agricultural giant revolves around a corporate rebate program designed to boost sales of Roundup, a popular weed killer.