Suppose a nylon $66$ sample has a density ${}_1=1\mathrm{.}18\frac{g}{c}{m}^3$ and a

crystallinity $($by weight$)$ of $67\mathrm{.}3\%.$ If the density of purely crystalline

nylon ${}_c=1\mathrm{.}242\frac{g}{c}{m}^3,$ what is the density ${}_2$ of a nylon $66$ sample

with crystallinity $40\%?$

${}_2=,\frac{g}{c}{m}^3$