Maximize with Manipulate

Hello Dear Members,
I am trying to include a manipulate to NMaximize function to see how the output values are changing for p and t. By varying the variable w, x, y and z.
Kindly please help me to resolve this, the file in attachment.
Thanks.

Manipulate[[NMaximize[{
(*Objective function*)
-6 p + 92 t,
(*Constraints*)
-0.3 p + 12 t >= (w - 11.81) &&
-4 p + 34 t >= (x - 228.92) &&
-3 p + 133 t == (y - 163.28) &&
6 p - 92 t >= (z - 128.69),
p >= 0 &&
t >= 0},
{p, t}]],
{w, 6, 16}, {x, 170, 200}, {y, 150, 300}, {z, 50, 200}]

Max_Frum_Hlp.nb (6.37 KB)

Does this work for you

Manipulate[
  NMaximize[{(*Objective function*)-6p+92t,
    (*Constraints*)-0.3p+12t>=(w-11.81)&&-4p+34t>=x-228.92&&
    -3p+133t==y-163.28&&6p-92t>=z-128.69&&p>=0&&t>=0},{p,t}],
  {w,6,16},{x,170,200},{y,150,300},{z,50,200}]

Dear Mr. Bill,
Thanks for your prompt reply. It works fine.
There was additional square brackets in my code after the manipulate.
Kind Regards.