Answer
100
Work Step by Step
78% of what number is 78 ?
78% $\times$ x = 78 Translate to an equation
0.78 $\times$ x =78 Write 78% as 0.78
$\frac{0.78x}{0.78}$=$\frac{78}{0.78}$ Divide both sides by 0.78
x=$\frac{7800}{78}$
x=100
Check
78% $\times$ x = 78
78% $\times$ 100= 78
0.78$\times$ 100=78
78=78
