Hi there, I am really not too sure what the objective function is, can you please explain?

A rm must fulfill an order of 100 units of q. They can convert two inputs, K and L, into output via the production function F(K, L) = BVKL. Every unit of K that they use costs $10. Every unit of L costs $40. The rm wants to minimize their production costs subject to fulfilling the order. Based on the above information, answer the following questions. (a) What is the objective function that the rm is minimizing? 2 marks