Question

Hey I just had a question regarding how to calculate VMPL (marginal revenue product). When looking for a specific formula, I got a whole bunch of different one's and it didn't seem like I had enough information to find any. I'm supposed to find it for the 5th worker who allows for 72 products to be made per day. The market wage is $90 per worker per day and each product is sold at $10 each. Is there anything else I need? That is all the question really gave me..I'd include a picture of the chart but it won't let me attach pictures here. thanks