An apartment building has potential gross annual income of $50,000. The vacancy factor is 5%. The maintenance expenses are $1,000 per month. The property taxes are $3,500 per year. The insurance is $2,500 per year. The reserve account is built at a rate of $200 per month. The mortgage payments are $1,500 per month. If the value of the building is $338,750, what is the capitalization rate?