求助涛涛 GWD 1-14

if 10⁵⁰  -74  is written as an integer in base 10 notation, what is the sum of the digits in that integer?

A 424

B. 433

C. 440

D. 449

E. 467

Answer is C. 

but i have no idea how to go about solving it.  Please hep!!!

thanks

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http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=176560&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=128922&page=1