Step 1
Jennif er's salary = $12000
Step 2
It is given that David gets $ 8400 more per month than Jennifer, therefore David's salary = 12000 + 8400 = $20400
Step 3
The fraction of the salaries of Jennifer and David = 12000 = 10 204 00 17
Step 4
Therefore the ratio of the salaries of Jennifer and David = 10:17