76. Estimate costs for a marketing campaign using the following data:

Activity	Estimated Cost ($)
Research	100,000
Advertising	150,000
Promotions	80,000
Events	120,000

Requirements:

• Calculate the total estimated cost for the campaign.
• Present the estimation process in a table.
• Explain the methodology used for cost estimation.
• Identify potential sources of uncertainty in the estimation.
• Provide strategies for managing cost uncertainties.