Put amount in cell B, multiplied by 11, yet leaving the number I input viewed

I have excel 2007
I'm not sure if excel can do this, if so it's beyond my figuring it out.
I need to input a dollar amount into cell A
I need to input another dollar amount into cell B, which is automatically multiplied by 11, yet leaving the number I input viewed,and then added to the value of cell A and automaticlly entered into cell C.
Cell D needs to contain 5% of cell C
Cell E needs to contain Cell D subtracted from Cell C.

If any of this makes sense and you can help....It will be much appreciated