When Ajax Co. produced 3 units of output per​ week, its total fixed cost was ​$100100 and total variable cost was ​$5050. When output increased to 4 units per​ week, total fixed cost remained at ​$100100 and total variable cost increased to ​$7070.
When output was 4 units per​ week, total cost was ​$_________? ​(Enter your response as an​ integer.)