If your campaign’s daily budget is US$20, how much of your budget can be spent to show your ads on certain days, based on fluctuations in traffic?

If your campaign’s daily budget is US$20, how much of your budget can be spent to show your ads on certain days, based on fluctuations in traffic? 

• Up to US$24 
• Up to US$21
• Up to US$20
• Up to US$30

The correct answer is:

Up to US$24