Answer:
rs=14.68%
F=15%
re=16.56%
Explanation:
using the constant growth model:
[tex]P0=\frac{D1}{rs-g}[/tex]
where P0 is the current stock price
      D1 is the dividend expected at the end of the 1st year
      rs is  cost of retained earnings.
Rearranging to make rs subject of the formula:
[tex]rs=\frac{D1}{P0}+ g[/tex]
[tex]rs=\frac{3.95}{37}+ 0.04 = 0.1468[/tex]
if Evanec issues new stock, they will only net $31.45 down from $37 per share due to floatation costs. The difference, ie  $37-$31.45 = $5.55 is due to floation costs.
The percentage floatation costs (F) are [tex]\frac{5.55}{37} = 0.15 = 15%[/tex]
alternatively, one can recognise that  [tex]37(1-F)=31.45[/tex]  and F = 15%
Cost of new common stock re is calculated as follows:
[tex]re=\frac{D1}{P0(1-F)}+ g[/tex]
[tex]re=\frac{3.95}{37(1-0.15)}+ 0.04 = 0.1656 = 16.56%[/tex]