Discussion :: Percentage
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What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?
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Answer : Option C
Explanation :
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 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.
Number of such number =14
Required Percentage = \([ \frac { 14} { 70} \times100]%=20%\)% = 20%
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