Keeping c subscript 2 constant at c subscript 2 =4 , the interval for c subscript 1 in which the current optimal solution remains optimal is

a. 24 over 7 less or equal than negative c subscript 2 less or equal than 6
b. negative 24 over 7 less or equal than c subscript 1 less or equal than 6
c. negative 6 less or equal than c subscript 1 less or equal than negative 24 over 7
d. 24 over 7 less or equal than c subscript 1 less or equal than 6
e. none of the above

Aproject currently generates sales of $14 million, variable costs equal 50% of sales, and fixed costs are $2.8 million. the firm’s tax rate is 40%. assume all sales and expenses are cash items. (a). what are the effects on cash flow, if sales increase from $14 million to $15.4 million? (input the amount as positive value. enter your answer in dollars not in (b) what are the effects on cash flow, if variable costs increase to 60% of sales? (input the amount as positive value. enter your answers in dollars not in millions). cash flow (increase or decrease) by $