Someone pls help.. has to be put in excel later on...

1. Lilys has decided to also offer lamps on-line, keeping separate profit and loss records for this new operation. Lily has calculated that the average price of the lamps shell sell on line will be $50, and the average cost will be $43.50. She feels its important to offer free shipping, so she has worked a deal with a local shipper at a flat rate of $2300 per month. Website and related costs are $475 a month. Lily has one dedicated employee, plus she has allocated a portion of her time at a monthly labor cost of $1850. (20 points)
   1. What is the contribution margin percent for the on-line lamps?
   2. How many lamps must Lily sell to break-even each month
   3. What is the break-even dollar amount?