AMC 12 2004b Problem 5

On a trip from the United States to Canada, Isabella took $d$ U.S. dollars. At the border she exchanged them all, receiving 10 Canadian dollars for every 7 U.S. dollars. After spending 60 Canadian dollars, she had $d$ Canadian dollars left. What is the sum of the digits of $d$?

$(\mathrm {A}) 5 (\mathrm {B}) 6 (\mathrm {C}) 7 (\mathrm {D}) 8 (\mathrm {E}) 9$