Thomas has finished 4 problems of his weekly math homework. If he needs to solve a total of 20 problems, which of the following shows the equivalent of the percentage of his math homework Thomas still needs to complete?
A. 20/100
B. 80/100
C. 0.20
D. 0.08
Thomas has finished 4 out of 20 problems, so he still needs to complete 20 - 4 = 16 problems.
To find the equivalent percentage, we divide the number of problems he still needs to complete by the total number of problems and then multiply by 100.
So the percentage of his math homework Thomas still needs to complete is (16/20) * 100 = 80/100.
Therefore, the answer is B. 80/100.