What percentage of numbers from 1 to 70 have 1 or 9 in the units digit?
Clearly, the numbers which have 1 or 9 in the units 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 =$ \left(\dfrac{14}{70} \times 100\right) $% = 20%.
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