# What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?

Total numbers in 1 to 70 which has 1 in the unit digit = 7

Total numbers in 1 to 70 which has 9 in the unit digit = 7

Total numbers in 1 to 70 which has 1 or 9 in the unit digit = 7 + 7 = 14

$\\ \text{The numbers which have 1 or 9 in the unit's digit, from 1 to 70 are}\\ 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.\\ \text{ Percentage of such numbers}=14 =\left(\frac{14}{70} \times 100\right) \%=20 \%$

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