A start-up organization is planning to use the AWS Budget so that it can plan its instance reservations, along with service usage and costs. It is agreed that 10 budgets would be created.
What would be the cost accured for these 10 AWS budgets by the organization?

Answer options:

A.(9 * rate of budget) per day.
B.(8 * rate of budget) per day.
C.(7 * rate of budget) per day.
D.(10 * rate of budget) per day.

Answer: B
You can add actions to your budgets to control IAM and Service Control Policy permissions as well as AWS resources when thresholds are exceeded (or forecasted to exceed). Your first two action-enabled budgets are free (regardless of the number of actions you configure per budget) per month. Afterward, each subsequent action-enabled active budget will incur a $0.10 daily cost.
Reference: 
https://aws.amazon.com/aws-cost-management/pricing/