What percentage of numbers from 1 to 50 have squares that end in the digit 5? Answers:  A) 1  B) 14  C) 10  D) 21  E) 22
Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 5. Such numbers from 1 to 50 are 5,15,25,35,45.   Number of such numbers = 14.   Required percentage = (5/50 * 100)= 
<gadget id="calculator">(5/50 * 100)</gadget>
<output>10</output>
10%   ANSWER:10
<result>C</result>
What percentage of numbers from 1 to 50 have squares that end in the digit 5?