desired_stock_price.py

# Buy price is the float value of the market price of the stock in question
buy_price = 0.623

# Budget is your budget for this purchase
budget = 400

# Per trade fee is any fee that you pay your brokerage house per transaction
per_trade_fee = 9.99

# This is your minimum desired return
min_desired_return = 90.00




################################
## Do not edit below this line #
################################

def possible_purchase(buy_price, budget, per_trade_fee):
    return int(((budget - per_trade_fee) / buy_price) )

def min_return(num_held, buy_price, min_desired_return, per_trade_fee):
    actual_return = 0.0
    sell_price = buy_price
    while actual_return <= min_desired_return:
        actual_return = (sell_price * num_held) - (buy_price * num_held) - per_trade_fee
        sell_price += 0.01
    return actual_return, sell_price, ((sell_price - buy_price)/(buy_price))

num_held = possible_purchase(buy_price, budget, per_trade_fee)
actual_return, sell_price, gain = min_return(num_held, buy_price, min_desired_return, per_trade_fee)

print "With budget of $%s, possible to own %i shares" % (format(budget, '.2f'), num_held)
print "Return of $%s from %i shares possible at $%s, representing gain of %f%%" \
% (format(actual_return, '.2f'), num_held, format(sell_price, '.4f'), gain)