heellpp me pls which equation can be used to solve the problem .60 percent of what number is 30 .

60x2 = 120
--------- this is a
30x2 = 60


30 divide 1 = 30 this is b
----------------
60 divide 1 = 60


60 divide 2 = 30
----------------- this is c
100 divide 2 = 50


100x2=200
---------- this is d
30x2 =60



NOTE pls vote and do not guess i will brainest you if right