ebeebay is a online marketplace. A Seller in ebeebay wants to sell Q quantity for P price each.
And there are many interested buyers - 1st buyer want to purchase Q1 quantities at P1 price each.
and 2nd buyer wants to purchase Q2 qunaities at P2 price each. so on.. where Q = Q1 + Q2 + Q3 + ... + Qn.
ebeebay is a neutral market place where it tries to find the mid price for both parties and make a best deal.

Example
SELLER wants to sell 100 (Q) smartphones at 200$ (P) each = 20000$ total selling price
BUYER1 wants to buy 60 (Q1) smartphones at 220$ (P1) = 13200$ total buying price
BUYER2 wants to buy 40 (Q2) smartphones at 210$ (P2) = 8400$ total buying price

caclculate mid price for each deal
SELLER & BUYER1 deal - 60 smartphones at 210$ (200+220)/2 price each.
SELLER & BUYER2 deal - 40 smartphones at 205$ (200+210)/2 price each.

20800$ will be total selling price for SELLER (deal price)
12600$ will be total buying price for BUYER1
8200$ will be total buying price for BUYER2

Now complete below python program which takes 1 seller qty & price and n buyer qty & prices.
1. print total selling price
2. print each buyers total buying price
3. find best buyer who contributed highest buy to the deal.

class RetailOrder(object):
    def __init__(self, qty, price):
        self.qty = qty
        self.price = qty

# seller - 1 RetailOrder with qty & price
# buyers - list of RetailsOrder's with qty & price
# implement you deal making logic below
def ebeebay_make_best_deal(seller, buyers)
    pass