price per 100g incorrect

e.g. oxo priced at £3 for 142g displays a price per 100g = £0.09, this is incorrect, the price for 100g here should = £2.11 per 100g i.e. if 142g costs £3 , 100g would cost £2.11 (aprox 30% less), 100g certainly wouldn't cost 9p as displayed. Please can you resolve the calculation issues as it makes the comparison between alternative sizes unreliable. Thanks