In $2009,1$ U$.$S$.$ dollar purchased $1400$ Korean won and in $2013$ it purchased $900$ Korean won. How much did $1000$ Korean won cost in U$.$S$.$ dollars in $2009$ and $2013?$

Question $11$Answer

a$.$

$2009$: $\mathrm{.}84$ dollars, $2013$: $1\mathrm{.}09$ dollars

b$.$

$2009$: $\mathrm{.}83$ dollars, $2013$: $1\mathrm{.}12$ dollars

c$.$

$2009$: $\mathrm{.}72$ dollars, $2013$: $1$ dollar

d$.$

$2009$: $\mathrm{.}71$ dollars, $2013$: $1\mathrm{.}11$ dollars