Ben runs a bakery, and in the recent year his total revenue was $$200,000.$ The bakery did not hire any employee, and its all expenses of materials, rents, utilities, etc., added up to $$50,000.$ Ben uses his own savings of $$100,000$ as the initial investment for the business, which could otherwise yield $10\%$ interest income in the bank. Ben used to be a skilled chef, and he earned $$90,000$ a year before he started this bakery.

According to the above information, answer the following questions.