There will be a midterm near the middle of the term (funny how they name things) worth 20% and a comprehensive final worth 30%.
To allow for some moving of up, I've included the monotonically increasing class participation function which has a theoretical maximum of 10%.
For those of you not keeping score, the sum total is 110%. The extra 10% is so that "border line" cases can be moved upwards. That is, frequent, eloquent, and informed class participation during lecture that pleases the instructor can recover up to 10% of the points that may have mysteriously gone missing from your other scores. You will not be penalized, however, for imitating the proverbial bump on the fabled log.