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+function z = profit (x, y)
+  A = [7 11; 10 8];
+  b = [77; 80];
+  c = [150; 175];
+  [m n] = size (x);
+  z = -inf (m, n);
+  for s = 1 : m
+    for t = 1 : n
+      r = [x(s, t); y(s, t)];
+      if A * r <= b
+        z(s, t) = dot (c, r);
+      endif
+    endfor
+  endfor
+endfunction