dosto kya aapne kabhi socha hai keh blind log currency notes ko kaise pehchante

Rs.20 wale py 1 line
Rs.50 wale py 2 lines
Rs.100 wale py 3 lines
Whai
Rs.500 wale py 1 dot
Rs.1000 wale py 2 dots
Rs.5000 wale py 3 dots