If your campaign’s daily budget is £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£30
  • Up to US£20

The correct answer is:

  • Up to US£24

Explanation: When your ads are shown more often, your total daily cost might be up to 20% more than your average daily budget. However, you won’t be charged more than your average daily budget multiplied by the average number of days in a month (30.4).

Read more here: https://support.google.com/adwords/answer/2375423?hl=en