Final answer:
To find the percentage of checks that were not from unknown vendors, subtract the number of checks from unknown vendors from the total number of checks and calculate the percentage.
Step-by-step explanation:
To determine the percentage of checks that were not from unknown vendors, we need to find the number of checks that were not from unknown vendors. Since 2 checks were from unknown vendors out of 200 total checks, the number of checks that were not from unknown vendors would be 200 - 2 = 198.
To find the percentage, we can use the formula:
Percentage = (Number of checks that were not from unknown vendors / Total number of checks) × 100
Substituting the values, Percentage = (198 / 200) × 100 = 99%
Therefore, the correct answer is 99% (option C).