Answer: d is correct
Step-by-step explanation:
<span>
</span><span>http://www.squiglysplayhouse.com/BrainTeasers/bt.php?id=119
this should help</span>
Since we are calculating the amount that he got correct, we must divide the numerator by the denominator or make the denominator equal 100. I will do it the second way as it is easier in this case.
25*4 = 100
21*4 = 84
84/100 = 0.84
As a decimal, Andrew got 0.84 of his test correct. Hope this helps!