The Age of Exploration: Chapter 2, Exercise 3 — Possible Solution
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QUALIFICATION
The source says the voyage demonstrated profit potential, but also that it
failed in its principal mission of securing a commercial treaty with
Kozhikode. The return took over 90 days instead of 23, and about half the crew
died, many from scurvy.

REWRITE
"Da Gama reached Calicut in 1498 and showed the profit potential of the route,
but he failed to secure a commercial treaty and about half his crew died on
the return."

CAUTION
The source gives no exact death numbers.