for example if you want to raise funds for a tour ($1000), you may calculate that running a car wash would require 200 cars to be washed at $5 per car. however if you also need to purchase buckets and sponges and advertise the event, at a cost of $160; you would need to calculate if it is worth running the car wash. in this instance you could hope to wash a few extra cars or have people bring their own buckets to offset the costs. even if you only washed 100 cars and made $500- would this be worth it for the club or would the time and money be utilised more efficiently on another project.