There is no money amount for any of the expenses... How much money did Valerie have when she went to the bowling alley?...
When it says x and y are directly related it means that x is multiplied by something to get y. To solve you divide y by x which is 840 divided by 6. Which is 140 then you multiply and solve so the y value for 5 is 700. The x value for 420 is 3 and the y value for 4 is 560.
Answer:
the number of words made = w
the number of tiles not used = t
the points earned from words made = 10w
the points taken away from tiles not used = 3t
(srry if this is wrong but I believe it's correct)
42,500x0.09 should get you your commission