Question 490802
Since you wnt to know your percent for the right ones (let the percent for correct ones be x)
First:42-14=30
next 42 correct means 100 percent
30 correct we need to find the percent.
42--------100
30--------x

So cross multiply: 
{{{42x=30 x 100}}}
{{{x=30 x 100/42}}}
{{{71.43}}}
Your percent is 71.43%