What percent of 25 is 30?

Well 100 percent of 25 is 25 and 100%/5=20% so 25 + 5 = 30 and 100% + 20% = 120% so 120% $${\mathtt{30}} = \left({\mathtt{25}}{\mathtt{\,\times\,}}{\mathtt{p}}\right) \Rightarrow {\mathtt{p}} = {\frac{{\mathtt{6}}}{{\mathtt{5}}}} \Rightarrow {\mathtt{p}} = {\mathtt{1.2}}$$ or 120%

$$30 percent of 25 is 7.5

just do: 25 x .3 = 7.5$$