The number of cords that must be sold in other to the total pay the same is 220
Let the number cable sold = c
We can create equations for the salary for the companies thus ;
Company 1 :
Company 2 :
To make the same amount; equate both expression
18000 + 30c = 11400 +60c
18000 - 114000 = 60c - 30c
6600 = 30c
c = 6600 / 30
c = 220