How much do u think it cost to start a business?

I took business class this sem and for our ISU is to write our own business plan. the business i choose was a photography store where customers can buy cameras and photography stuff. we also have class where we teach about photography. like experiences and we also do photo shoots. for the financial part i put $200,000 in order to start my business but i feel like its so much. Do you think $200,000 is a lot? The rent for the whole year is include. its in a down town area too my business.