From Technician and STAB, Fury Swipes recieves two x1.5 boosts. So, doing the math,

18 x 1.5 x 1.5 = 40.5

Base power is always rounded down to the nearest integer, so 40.5 is rounded down to 40.

Each hit of Fury Swipes will have **40 base power.**

If you are lucky enough to land all 5 hits, the total base power will be 200.