Task: Question Answering
Input (English): Problem: the citizens of planet nigiet are 5 fingered and have thus developed their decimal system in base 8 . a certain street in nigiet contains 1000 ( in base 5 ) buildings numbered 1 to 1000 . how many 3 s are used in numbering these buildings ? express result in terms of base 10 . 
Options: ['a ) 54', 'b ) 64', 'c ) 75', 'd ) 85', 'e ) 100']
Output (English): c