Consider the table below that describes the production function for Q in terms of its inputs L and K

If labor is $10 per L and capital and $50per K, what is thevariable costof producing 40 units? (do not include a $ in your answer)

K Q 10 1 5 10 2 15 10 3 30 10 4 40 10 5 45 10 47 10 48