The following table indicates the number of candidates who appeared in an entrance examination from four different cities A, B, C. D and the ratio of passing and failing. Stuty the table carefully and answer the question.
| City | No. of candidates appeared | Ratio of passing and failing | 
| A | 660 | 5 : 6 | 
| B | 650 | 2 : 3 | 
| C | 500 | 3 : 2 | 
| D | 630 | 4 : 5 | 
Which city has the highest number of candidates who failed in the entrance examination and find its rate of percent in the city,respectively?