You have configured a Sampling Rule in AWS X-Ray, with a reservoir size as 60 & a fixed rate at 20%. There are 200 requests per second matching the rule defined. How many requests will be sampled per second?

Answer options:

A.88 requests per second
B.60 requests per second.
C.40 requests per second.
D.120 requests per second.

Correct Answer – A
Let us suppose that we specify a value for Reservoir Rate as 60 and Fixed Rate as 20. Now, if your application receives 200 requests in a second, then the total number of requests that would be traced or sampled will be: - 
"Reservoir Rate" + Fixed Rate % [(Total Requests - Reservoir Rate)] 
- 60 + (200-60) * 20%
- 60 + (140) * 20%
- 60 + 28 
- 88
Option B, C, & D are incorrect as these values are not matching the reservoir size & fixed-rate sampling rate.
For more information on Configuring Sampling Rules in the AWS X-Ray Console, refer to the following URL-
https://docs.aws.amazon.com/xray/latest/devguide/xray-api-sampling.html