Bernice makes this design on a square sheet of paper. The paper has a side length of 20 cm. Each triangle has a base of 12 cm and a height of 10 cm. Find the area of the white part of the design. Show your work.

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?