The art club designed and made banners of the school colors, blue and white, for their fund-raiser. Each banner required `1/4` yard of blue material and `3/8` yard of white material. The club originally planned to purchase exactly enough material to make 500 banners, but found the material to be cheaper if purchased i full bolts - the blue material in 10 yard bolts and the white material in 12-yard bolts. How many extra banners was the club able to make if they purchased enough full bolts to make at least 500 banners?