which investment produces a $40 daily profit for a game shop earning $2 profit from every game sold?

a. vehicle with $120 daily operating cost, delivering 80 games per day
b. inventory software with $10 daily operating cost, saving 30 games per day from theft
c. game cleaning system with $5 daily operating cost, increasing sales by 15 games per day
d. electronic billboard with $20 daily operating cost, increasing sales by 20 games per day