Consider the supply chain illustrated below: Last year the retailer's weekly variance of demand was 210 units. The variance of orders was 510,600,770, and 1,300 units, for the retailer, wholesaler, distributor, and manufacturer, respectively. (Note that the variance of orders equals the variance of demand for that firm's supplier.) a) The bullwhip measure for the retailer is (Enter your response rounded to two decimal places.)