(i) x + 3y ≤ 12
(ii) 3x + y ≤ 12
(iii) x ≥ 0,y ≥ 0
ABCD is the solution region A(0, 0) P = 0
A (0, 0) p = 0
B (4, 0) P = 70 Rs .
C (3, 3) P = 73.5 Rs
D (0, 4) P = 28 Rs.
At (3, 3) he can maximise his profit. By producing 3 packages of nuts and bolts each.