P$1315$ MODIGLIANI & MILLER PROPOSITIONS A certain firm with no debt that operates in perfect capital markets currently generates a $7\mathrm{.}5\%$ return for its shareholders and can issue debt at a cost of $5\%.$ Determine the firm$$s ROE at the following debt$-$to$-$equity ratios: $0\mathrm{.}5,1\mathrm{.}0,$ and $1\mathrm{.}5.$