Penny started a business that sells flower barrettes called Penny Blossoms. Penny asks Sheldon to help her improve her manufacturing process, so they sing while working in order to increase productivity.
Doris felt that Roger was spending too much money on services for the annual charity ball, so she leverages the philanthropic nature of the event to significantly drop the price on all the services that Roger purchases. The end result: $11,553 extra for the orphanage fund.
The Eds deliver newspapers to the homes in the cul-de-sac in order to earn money. After running into obstacles such as fences and dogs, they decide to invent an easier and more efficient way of delivering the papers. Their invention malfunctions when Ed throws Eddy's bed into the newspaper machine.