Consider the information below for Postman Builders Inc. Suppose that the expected inflation rate and thus the inflation premium increase by $2\mathrm{.}0$ percentage points, and Postman acquires risky assets that increase its beta by the indicated percentage. What is the firm's new required rate of return?

Beta: $1\mathrm{.}50$

Required return $($rs$)10\mathrm{.}20\%$

RPM: $6\mathrm{.}00\%$

Percentage increase in beta: $35$

Select the correct answer.

a$.15\mathrm{.}14\%$

b$.15\mathrm{.}21\%$

c$.15\mathrm{.}42\%$

d$.15\mathrm{.}28\%$

e$.15\mathrm{.}35\%$