Ned got an overall grade of 86 percent because if each question is 4 points, then 6×4=24 but if he got a bonus 10 points, then you can do 24-10=14 and then you do 100-14 which equals your answer: 86.
Two terms
bi is latin for two, therefore a binomial has two terms
24*16.9=405.6
405.6/4.99=<span>0.812825651303
</span> which gives you $0.81 per bottle