$${\frac{{\mathtt{25}}}{{\mathtt{100}}}}{\mathtt{\,\times\,}}{\mathtt{30}} = {\frac{{\mathtt{15}}}{{\mathtt{2}}}} = {\mathtt{7.5}}$$
$${\frac{{\mathtt{70}}}{{\mathtt{100}}}}{\mathtt{\,\times\,}}{\mathtt{25}} = {\frac{{\mathtt{35}}}{{\mathtt{2}}}} = {\mathtt{17.5}}$$
$${\frac{{\mathtt{25}}}{{\mathtt{100}}}}{\mathtt{\,\times\,}}{\mathtt{30}} = {\frac{{\mathtt{15}}}{{\mathtt{2}}}} = {\mathtt{7.5}}$$
$${\frac{{\mathtt{70}}}{{\mathtt{100}}}}{\mathtt{\,\times\,}}{\mathtt{25}} = {\frac{{\mathtt{35}}}{{\mathtt{2}}}} = {\mathtt{17.5}}$$