what is the percentage increase from 6.2 billion adding on 7.2 billion

1/6.2*100

 

$${\frac{{\mathtt{1}}}{{\mathtt{6.2}}}}{\mathtt{\,\times\,}}{\mathtt{100}} = {\frac{{\mathtt{500}}}{{\mathtt{31}}}} = {\mathtt{16.129\: \!032\: \!258\: \!064\: \!516\: \!1}}$$    percent