Discounted total

Orders of 100 or more get 20% off, orders of 50 or more get 10% off, smaller orders pay full price. Write to_pay(total) that returns the amount to pay, rounded to two decimal places.

to_pay(120)    ->  96.0
to_pay(60)     ->  54.0
to_pay(77.77)  ->  69.99
to_pay(20)     ->  20      (20.0 is fine too)

def to_pay(total):
    ...