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

A. 19

B. 20

C. 21

D. 22

View Answer

1

Correct Answer :
20

Explanation :

The numbers between 1 to 70 (including 1) that have 1 or 9 at the end (unit's place) are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.

So, total numbers are 14

Percentage that 14 constitutes of 70 = ( 14 / 70 ) x 100 = 20%

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