Acompany figured that if it had 50 more employees and paid each one $2 per day less, the payroll would increase $620 per day. if it had 50 less employees and paid each $4 per day more, the payroll would decrease $640 per day. how many employees does the company now have?

To answer this item, we let x be the number of employees and y be the pay each day of each of the employee. Currently, the payroll is equal to xy. The equations that would best represent the given situation above are,
 
                              (x + 50)(y - 2) = xy + 620
                 and      (x - 50)(y + 4) = xy - 640

The values of x and y in the equations can be calculated through elimination or substitution method.
 The values are 140 and 20, respectively. Thus, there are 140 employees currently. 

The answer is letter a