If one plex costs £16.99 and equals 735 million isk. How much would it cost to get 7 billion isk.

$${\frac{{\mathtt{16.99}}}{{\mathtt{735\,000\,000}}}} = {\frac{{\mathtt{x}}}{{\mathtt{7\,000\,000\,000}}}}$$

$$\mathrm{\ }$$$${\mathtt{735\,000\,000}}{\mathtt{\,\times\,}}{\mathtt{x}} = {\mathtt{7\,000\,000\,000}}$$

$${\frac{{\mathtt{7\,000\,000\,000}}}{{\mathtt{735\,000\,000}}}} = {\frac{{\mathtt{200}}}{{\mathtt{21}}}} = {\mathtt{9.523\: \!809\: \!523\: \!809\: \!523\: \!8}}$$

9.5238095238095238 is the number the 735,000,000 was multiplied by to get 7,000,000,000. Thus, to equal out, you would multiply 16.99 by 9.5238095238095238

$${\mathtt{16.99}}{\mathtt{\,\times\,}}{\mathtt{9.523\: \!809\: \!523\: \!809\: \!523\: \!8}} = {\frac{{\mathtt{3\,398}}}{{\mathtt{21}}}} = {\mathtt{161.809\: \!523\: \!809\: \!523\: \!809\: \!4}}$$

It would cost £161.81

Good job, GL !!!

Your points are a mountin' up !!!

(But, you're still not gonna' catch me !!!....... LOL!!)

(Now...get back to that solo !!!)