Answer:
2 benches
Explanation:
Selling Price per bench = $175
Cost per bench = $100
profit per bench = $175 - $100 = $75
assuming that he sell x benches a month,
profit in 1 month = $75x
given that his advertising costs are $150 per month, in order to break even, his profit must be equal to his advertising profit.
i.e
$75x = $150
x = 150/75
x = 2