Drew Is Taking an Economics Class in Which Two Tests

Drew is taking an economics class in which two tests and a final will be given.The two tests are worth 25% each while the final exam counts for 50%.Drew's final score will be

A) (.25) (Score on Test 1) + (.25) (Score on Test 2) + (.50) (Score on Final Exam) .
B) (Test 1 + Test 2 + Final Exam) /3.
C) (.33) (Test 1) + (.33) (Test 2) + (.33) (Final Exam) .
D) (25) (Test 1) + (25) (Test 2) + (50) (Final Exam) .