Hey, i haven't done algebra in forever so if anyone could me with this to refresh my memory, it'd make this summer packet so much easier.

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

41/17 as a decimal rounded to the nearest hundredth

Can you me find the missing length. i attached an image.