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?

Ques:- What percentage of numbers from 1 to 70 have squares that end in the digit 1?
A. 1
B. 14
C. 20
D. 21

1 7345

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