For each white square, we put a zero. For each black square, we put a one. And then we turn it on its side, like this, zero one zero zero one one zero zero and this we know is the two to the seventh place two to the sixth, two to the fifth two to the fourth, two to the third two to the two, two to the one and two to the zero and two to the sixth is 64 plus two to the third is 8 plus two to the two is 4 and that's equal to 76. So C was the right answer.