Or you could just use:
Drift = crosswind component divided by groundspeed in nm/min.
No headwind component, so g/s = 100 mph (close enough to 90 kt).
Crosswind = 11 kt, g/s (approx) = 1.5 nm/min, so there's 7 degrees of drift.
Hdg = 083.
No computer required except your brain.