A cost means the amount of money or resources expended on something while a benefit means the thing that we gain from an actitivy.
What is C & B of getting a dental checkup?
The benefits of going to the dentists is to get your teeth cleaned but the cost is paying for the dentist and maybe going for another checkup.
What is C & B of getting an extra hour of sleep?
The benefits of getting an extra hour of sleep is that you will be more alert in the morning but the cost is you get less time to do things.
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