Answer: (24)(35)+(15)(15)-120
The store BOUGHT all of the keyboards and chargers for 120, so you subtract that from your total. The store bought 24 keyboards and sold them each for 35 dollars. So you would multiply the values together. (24)(35). The store had 15 phone chargers and sold them each for 15 dollars. (15)(15). Assuming the store sold everything, and factoring in the loss of money from buying, your equation would be (24)(35)+(15)(15)-120.
Explanation:
840+225-120=945