Scoring system in "Space Crusade"

edited February 2015 in Games
Can anybody explain how does "Space Crusade" calculate mission score?
Manual says that completing the Primary Mission is worth 30 points. But how many points is for completing the Secondary Mission or killing aliens?

It's annoying when I complete Primary Mission and kill a bunch of aliens but mission is failed because my score is below 80.

Is it possible to win without completing a Secondary Mission?
ZX Spectrum +2 & PicoDiv SD,
Timex 2048 & divIDE 57c
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