Ok first off you want to build up your reputation, so you can get more customers. Set all ingredients on Max amount so it will be a very good coffee. Next purchese 50 cups, 40 coffee, 40 milk, and 50 sugar. Make the price small like between 1.50 and 2.50, this will get you very popular. Keep this up for the next 6 days.
For the last 7 days hike up your price to between 4.00 and 7.00, remember the more the price the less reputation you'll get. Finally on the 14th day, make your price 10$ and sell as much as you can.
One the first day buy 10 units of cups, 40 coffee, 20 milk, 50 sugar. set the ingredients at max.
set your price between 4.00-$5.00. match your prices with the weather for the following day. whenever it's freezing or cold, you can increase your price between 5.00 to 6.00, and whenever its warm set it between 4.50 to 5.
your reputation will increase as the days go by, your reputation will reach its max either by the 5th or 6th day.
if your reputation is high enough you can have the option of setting your prices higher. On my first try i've made about 700.00 by the last day.
Awesome guide! I followed your advice, and got number six-thousand something th place! Not only the top 10,000, but the top 7,000!! The main thing was to buy 15-25 cups worth of ingredients per day. But, following you price ranges and initial purchases, I did really well!