How to get te award ''earning interest at the bank''

Helllo everyone, I just finish the game and I missing 5 awards, one of them is earning interest at the bank,and I have no clue how much money I need for that, and in wich planet and level I could reach that award, any help will be greatly appreciate.

This award is best earned on Level 1-6...you can even get gold time doing it. The key to this one is that you can't sell anything to earn money....you have to get goal strickly by interest at the bank. Trap the foxes, but don't put them in storage as this will decrease your space. Start off by clicking on bank and purchasing one goose. Keep clicking on bank as soon as it becomes available and use the interest to purchase the clouds, machines and another goose. I finished with gold time of 3:20 and earned the award.

Thank you Badgerfann, I try it and I finally got one more awards, 4 mores to go ....

Got it. Easy enough once I knew what it required. Thanks!