Investors require a $7\%$ rate of return on Mather Company's stock $($i$.$e$.,r_s=7\%).$

a$.$ What is its value if the previous dividend was $D_0=$$$2\mathrm{.}50$ and investors expect dividends to grow at a constant annual rate of $(1)-3\%,(2)0\%,(3)3\%,$ or

$(4)6\%?$ Do not round intermediate calculations. Round your answers to the nearest cent.

$(1)$ $

$(2)$ $

$(3)$ $

$(4)$ $

b$.$ Using data from part a$,$ what would the Gordon $($constant growth$)$ model value be if the required rate of return was $8\%$ and the expected growth rate was $(1)$

$8\%$ or $(2)12\%?$ Round your answers to the nearest cent. If the value is undefined, enter N$/$A$.$

$(1)$ $

$(2)$ $