SUSTAINABLE GROWTH RATE Weatherford Industries Inc. has the following ratios: A0*/S0 =
1.6; L0*/S0 = 0.4; profit margin = 0.10; and retention ratio = 0.55, or 55%. Sales last year were
$100 million. Assuming that these ratios will remain constant, use the AFN equation to
determine the maximum growth rate (the sustainable growth rate) Weatherford can achieve without having to employ nonspontaneous external funds.