6% = 3/50
$${\frac{{\mathtt{6.5}}}{{\mathtt{50}}}} = {\frac{{\mathtt{13}}}{{\mathtt{100}}}} = {\mathtt{0.13}}$$
$${\mathtt{0.13}}{\mathtt{\,\times\,}}{\mathtt{3}} = {\frac{{\mathtt{39}}}{{\mathtt{100}}}} = {\mathtt{0.39}}$$
$$\left({\frac{{\mathtt{6}}}{{\mathtt{100}}}}\right){\mathtt{\,\times\,}}{\mathtt{6.5}} = {\frac{{\mathtt{39}}}{{\mathtt{100}}}} = {\mathtt{0.39}}$$
You made that look really complicated MG your answer was good though, thank you :)
Maybe you have caught CCD from me too