Let x represent the total salary. If the amount saved is $6600 and this is 12% of the total salary, it means that
12% of x = 6600
Recall, percentage is expressed in term of 100. It becomes
12/100 * x = 6600
0.12x = 6600
x = 6600/0.12
x = 55000
The total salary was $55000
