Let x=0.59 bar=0.59999999.............. .....(1)

Now multiply both sides by 10

We get 10x=5.999999............... ...........(2)

We can't subtract (1) from (2)

So multiply both sides by 100

We get 100x=59.9999999............. ........(3)

Now subtract (2) from(3)

We get, 100x-10x=59.9999......- 5.9999999.......

90x=54

X=54/90

=3/5( after simplifying)