Answer:
D. 16 days
Explanation:
Set up an equation where x is the number of days.
60x will represent his cost to rent the equipment.
35x + 400 will represent his cost if he buys the equipment.
Set these equal to each other and solve for x:
60x = 35x + 400
25x = 400
x = 16
So, the break even point is 16 days.