In planet Twesmt, 1 year has 10 months, 1 months has 10 weeks, 1 week has 4 days. Different from our Earth, the workers there go to work 2 days a week, and earn 1 GO (an unit of money in that planet) each 5 days working. Know that 1 GO = $10, how many dollars that an person who works often in planet Twesmt (always 2 days each week) earn?
Also know that he always spend 1 GO per month.