Problems Brerclse Price

$45$

$50$

$55$

$58$

$\backslash$table$[[$Call Premlum,Put Premlum$],[13\mathrm{.}29,2\mathrm{.}18],[10\mathrm{.}32,4\mathrm{.}08],[8\mathrm{.}44,7\mathrm{.}08],[6\mathrm{.}52,8\mathrm{.}09]]$

Please answer the following questions showing all the calculations.

a$.$ What is the maximum profit of a bull spread using $\frac{50}{55}$ call strike prices $(6$ polmi

b$.$ What is the trading range over which the strip using $55$ is profitable