250 Reaction at the supports of cantilever truss

$\Sigma F_V = 0$

$A_v = 10.8 \, \text{ kN}$
 

The given load and A_V produce a counterclockwise couple
$C = 1.8(10.8)$

$C = 19.44 \, \text{ kN}\cdot\text{m counterclockwise}$
 

$\Sigma F_H = 0$

$B_h = A_h$
 

Since B_h = A_h, the two are clockwise couple.
$C_{counterclockwise} = C_{clockwise}$

$19.44 = 1.2B_h$

$B_h = 16.2 \, \text{ kN}$
 

Thus,
$A_h = 16.2 \, \text{ kN}$
 

Summary (answer)
$A_v = 10.8 \, \text{ kN upward}$

$A_h = 16.2 \, \text{ kN to the left}$

$B_h = 16.2 \, \text{ kN to the right}$