What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?	Choose the correct option:
A) 20
B) 21
C) 12
D) 22
E) 24
Clearly, the numbers which have 1 or 9 in the unit's 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   Required percentage =((14/70)x 100)% = 20%.   20NSWER 20
<result>A</result>
What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit?