Steven Converted $1,000 to ×105,000 for a Trip to Japan

Steven converted $1,000 to ×105,000 for a trip to Japan.However,he spent only ×50,000.During this period,the value of the dollar weakened against the yen.Considering a current exchange rate of $1 = ×100,how many dollars did Steven spend on the trip?

A) $550
B) $523
C) $450
D) $600
E) $500