Answer:
10%
Explanation:
To find the percentage of well-done burgers, we need to divide the number of well-done burgers by the total number of burgers and then multiply by 100%. In this case, we have 1 well-done burger and 10 total burgers, so the percentage of well-done burgers is 1/10 * 100%, or 10%. Therefore, the answer is 10%.