There is a farm in the shape of a rectangle with a length of 3.6 kilometers (km) and a width 2.5 times its length. If half of this farm is for cattle and half is for pigs, find the area of the cattle area in square kilometers (km2).
3.6 3.6 2.5 [OP_MUL] [OP_MUL] 2 [OP_DIV]
var_a = 3.6
var_b = 3.6
var_c = 2.5
var_d = var_b * var_c
var_e = var_a * var_d
var_f = 2
var_g = var_e / var_f
print('{:.2f}'.format(round(var_g+1e-10,2)))