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

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

[EXIM Bank MTO-2013 : 2013]

1. 10%

2. 14%

3. 20%

4. 21%

5. None of these

Answer

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