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.