The higher value for the serviceability index is

a$.$ Non.

b$.4\mathrm{.}2$

c$.5.$

d$.2\mathrm{.}5$

Find the structural coefficient for the surface with elastic modulus $300000$ psi

a$.0\mathrm{.}12.$

b$.0\mathrm{.}35.$

c$.0\mathrm{.}44.$

d$.0\mathrm{.}14.$