A lady starts from her house with some money to visit four Churches.
As soon as she enters Church1 her money gets doubled. She donates $100 and moves.
At Church2 again her money is doubled and she donates $100.
Her money is doubled again at Church3 and she donates $100.
At Church4 again her money gets doubled. She donates $100 again and returns home empty handed…
How much money she had when she started from her house???