High Low Method

A business has experienced the following labour costs:    

Output   (units) 7,000  Cost   ($)    86,000
Output   (units) 12,000  Cost   ($)  141,000
Output   (units) 9,000  Cost   ($)  102,000

Fixed costs increase by $15,000 for output in excess of 10,000 units. 
Using the high low method what is the estimated cost of producing  14,000 units ? 

Ans:

Take the highest and lowest output and associated costs when fixed  costs are constant.

High – (units) 9,000 Cost ($) 102,000   
Low – (units) 7,000 Cost ($) 86,000   
Change – (units) 2,000 Cost ($) 16,000

Hence VC = $16,000/2,000 = $8 per unit. 
FC = 102,000 – (9,000 × 8) = 30,000 at output under 10,000 units. 
So cost of 14,000 units = 30,000 + 15,000 + (14,000 × 8) = 157,000 

What make me confuse is that shouldn’t Highest units should be 12,000 and costs 141,000? How come the answer take 9,000 units as highest one? Please, please, please tell me what am i missing here. Thank you so much