you just need to find how many ''8%''' ther is in 100% so 100\8 = 12.5 times a ''1 unit'' = 12.5 unit
this is called crossed product
easier to unduerstand when you wright it like 8 1
______ = _____ so you say 100 x 1 \ 8 = (100x1) \ 8 = 100 \ 8 = 12.5
\
100 unknown
