Explanation:
you mean
70% of x = 70
right ?
you know that the "whole" is represented by 100% ?
this is easy here, but in general, when in doubt, find either 100%, calculate 1% as 100%/100 and find the desired %, or you find 1% directly and calculate the needed % (incl. 100%) out of this.
so, we know, 70% = 70
that means
1% = 70%/70 = 70/70 = 1
and then
100% = 1%×100 = 1×100 = 100
so,
70% of 100 = 70
now you see, why I said this is easy in this case here. because % and the absolute numbers have the same units. so, this goes 1:1.