Just divide 13/40, then multiply the result by 100.
32.5%
13 and 1/3%
% rate:= (13/40) x 100%= 0.325 x 100%= 32.50%
If by grade you mean percentage, you would have scored 67.5%. 40-13= 27 (27/40) * 100
To find the percentage of incorrect answers, divide the number of wrong answers by the total number of questions and then multiply by 100. So, ( \frac{13}{40} \times 100 = 32.5% ). Therefore, 32.5% of the answers are wrong.
This is a basic percentage problem. When we see a percentage problem, we always see the words "of". The word "of" means to multiply. So, the question is, what is 32.5% of 40? Simple. Change 32.5% to a decimal, or 0.325. then, we simply multiply the number 40 by 0.325. 0.325 x 40 = 13
32/40 as a percentage is 80%
It is: 10/40 = 25% as a percentage
35/40 as a percentage = 35/40 * 100 = 87.5%
23 out of 40 as a percentage = 100*23/40 = 57.5%
40 as a percentage of 220 = 100*40/220 = 18.1818..
20 is 50% of 40.