Starbucks reports net income for $2015$ of $$2,956\mathrm{.}4$ million. Its stockholders' equity is $$6,527$ million and $$7,073$ million for $2014$ and $2015,$ respectively.

a$.$ Compute its return on equity for $2015.$

Round answer to one decimal place $($ex: $0\mathrm{.}2345=23\mathrm{.}5\%)$

b$.$ Starbucks repurchased over $$1\mathrm{.}4$ billion of its common stock in $2015.$ Did this repurchase increase or decrease Starbucks' ROE?

ROE usually decreases since the repurchase of shares reduces the denominator $($avg$.$ stockholders' equity$).$

ROE usually increases since the repurchase of shares reduces the denominator $($avg$.$ stockholders' equity$).$

ROE usually increases since the repurchase of shares increases the denominator $($avg$.$ stockholders' equity$).$

ROE usually decreases since the repurchase of shares increases the denominator $($avg$.$ stockholders' equity$).$

c$.$ If Starbucks had not repurchased common stock in $2015,$ what would ROE have been?

Note: Round answer to one decimal place $($example: $20\mathrm{.}6\%).$