The premiums are the prices people pay to have the insurance coverage. The deductible is the amount one pays if he or she needs to use the insurance, in this case, if someone needs a surgery.
If 1,000 people register for Atrap, it's $150*1,000 = $150,000.
If 5 people need surgery, it's 5*25,000 = $125,000 in expenses.
Antrap has 2,500*5 = $12,500 in deductibles. That makes the expenses $112,500.
So, $150,000-112,500 = $37,500
Answer: Atrap has $37,500 gains.