Reworked on Session 3 day 1 slides.
Changed problem statement. Solved the problem. Included pie charts.
# round using int
n = 17.3 # any float
int (n + .5)
# round it off to first decimal place
round(amount * 10) / 10.0
# round it off to nearest 5 paise
round(amount * 20) / 20.0
# exchange two variables
a, b = b, a