Executives at Golden Baking Co$.$ have been doing competitor research on their rival, Purity Grahams. The team at Golden Baking has determined that, last year, Purity Grahams had market share of $13\mathrm{.}5\%$ and earned $38\mathrm{.}4\%$ share of requirements from Purity customers, who had a usage index of $108\mathrm{.}8\%.$ Find PENETRATION SHARE for Purity Grahams, given these numbers. $($Report your answer as a percent, and round your answer to the nearest tenth of a percent. Report $27\mathrm{.}5\%,$ for example, as $"27\mathrm{.}5".)$

answer to this question is $32\mathrm{.}3-$ show me how to figure this out