What percentage of numbers from 1 to 80 have 1 or 9 in the units digit?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 20%
There are total of 16 numbers between 1 and 80 which consist 1 or 9 in their unit digit i.e (1, 9, 11, 19, 21, 29, .....79)
Required percentage = 16/80 × 100 = 1600/18 = 20%