The Sooner Equipment Company has total assets of $100 million. Of this total $40 million was finance with common equity and $60 million with debt (both long and short term) its average accounts receivable balance is $20 million and this represent and 80 day average collection period. Sooner believes it can reduce its average collection period from 80 days to 60 days without affecting sales or the dollar amount of net income after taxes (currently 5 million). What will be the effect of this action on Sooner's return on investment and its return on stockholder's equity if the funds received by reducing the average collection period are used to buy back its common stock at book value? What impact will this action have on Sooner's debt ratio?