Hi, may I know how do they calculate the changes of the ratio to averages? As example, how does the retention ratio of 0.38 be average retention rate of 0.61? Thank you

FCFE GROWTH RATE (C) FCFE GROWTH RATE (G) IMPLIED BY PRAT MODEL Walmart Inc. PRAT model Average Jan 31, 2018 Jan 31, 2017 Jan 31, 2016 Jan 31,2015 Jan 31, 2014 Jan 31. Selected Financial Data (USD $ in millions Cash dividends declared Consolidated net income attributable to Walmart Net sales Total assets Total Walmart shareholders 6.124 6.185 6139 9862 16.022 95761 481317478.614 482 229473076 46 204522198.825199581 203 706204751 203 77 869 77.798 1.394 76.255 Retention rate Profit margin Asset turnover Financial leverage 0.62 0.62 199% 242 263 242 2.40 237 2.31 2.56 2.48 2.50 2.69 Retention rate Profit margin Asset turnover 0.61 2-37