Discussion
What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?
Answer: C
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
Therefore, Required percentage \(=(\frac{14}{70} \times 100)\)% \(= 20\)%
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