How to get median of grades that has corresponding units/weights?

I'm currently confuse. I know you can get weighted mean by using this formula: the summation of (weight x the score) divided by the summation of the weight but what if i'm ask to get the median? Should I just ignore the units/weights? Or should I multiply the grades and the unit, arrange then get the median?

Here an example (grade,unit; grade,unit. . .): 78,3; 98,4; 89,2; 84,2; 90,3

Weighted mean: 88.71

Median=?

Thanks for the help guys!