Question

What percentage of numbers from 1 to 50 have 0 or 5 in the unit’s digit

Answer 1

From 1 to 50

Numbers 5,10,15,20,25,30,35,40,45,50 will have 0 or 5in its unit digit.

====10 numbers

50=100 percent

1 percent=0.5

X perecent=10 numbers

10/0.5=20 percent

Therefor 20 percent numbers will have 0 or 5 in its units place