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Step 4

 Now, let us calculate C₁, C₂ and C₃ to compute minimum savings per year. Let, C₁=cost/component at speed 330 RPM.

T_c1 ≈ T_ac = 1.21min (from step 2)

T₁ = 750 min (from step 2)

C₁ = 24.68 paise / component

 Similarly, cost per component at spindle speed 535 is C₂. Then,

T_c2 = 0.748 min. (from step 2)

T₂ = 11.2 min. (from step 2)

Therefore,

C₂=34.34 paise / component

Let the cost per component at speed V_opt be C₃. Then,

T_c3  ≈ T_{ac 3}

=          l / f_{N 3}

= 0 .1524/3 .81 × 10 ^{- 4} × 406

T_c3  = 0.985 min.

T₃ = B/(V_opt ) ^{1 / n}

= (2.53 ×10¹⁹ )/(97.18)^8.71

T₃ = 123.4 min

C₃ = 22.72 paise / component

Minimum profit anticipated = C₁ - C₃

= 24.680 - 22.716 (while calculating profit from (C₂ - C₃), it will be more)

=1.96 paise / component

Total profit / year = (1.96 × 30000 )/100

= Rs. 589.22

Minimum profit anticipated = Rs. 589.22 per year