What percentage of numbers from 1 to 50 have squares that end in the digit 4? Pick.
A) 1
B) 14
C) 25
D) 21
E) None of the these
Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 4. Such numbers from 1 to 50 are 2,8,12,18,22,28,32,38,42,48.   Number of such numbers = 10.   Required percentage = (10/50 * 100)= 
<gadget id="calculator">(10/50 * 100)</gadget>
<output>20</output>
20%   ANSWNone of the theseR:None of the these
<result>E</result>
What percentage of numbers from 1 to 50 have squares that end in the digit 4?