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What percentage of numbers from 1 to 70 have squares that end in the digit 1 ?

What percentage of numbers from 1 to 70 have squares that end in the digit 1 ? Correct Answer 20

Squares that end in the digit 1 be number of last digit 1 & 9. So numbers are 1, 9, 11, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69. So total number is 14. ∴ Percentage = 1470×100 = 20

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