In an interchangeable assembly, shafts of size 25.000+0.040-0.010

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In an interchangeable assembly, shafts of size 25.000^+0.040^-0.010 mm mate with holes of size 25.000^+0.030^-0.020 mm. The maximum interference (in microns) in the assembly is

1. 40
2. 30
3. 20
4. 10

Correct Option: C

Maximum Interference = Allowances = Difference
Between Maximum Material limit.
⇒ D_max for shaft = 25.040mm.
D_min for Hole = 25.020mm.
Max. Interference = 25.040 – 25.020 = 20µm