4. High Meadow Mfg. Co. sold its product through wholesalers and retailers-allowing the wholesalers a markup of 25 percent and retailers a markup of 40 percent. If the retail selling price is $100 and the manufacturer's cost is $30, what markup (in dollars) did High Meadow Mfg. receive on the sale of this product? Explain your answer and show calculation steps.

Cost price= selling price(1-markup %)

(The answer is $15 I have absolutely no idea how to get there though)