What percentage of numbers from 1 to 100 have cube that end in the digit 5?  Choose the most appropriate option.
A) 1
B) 10.5
C) 25
D) 20
E) 22
Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 95 are 5,15,25,35,45,55,65,75,85,95.   Number of such numbers = 95.   Required percentage = (10/95 * 100) = 10.5%   ANSWER:10.5
<result>B</result>
What percentage of numbers from 1 to 100 have cube that end in the digit 5?