ORIGINAL WORKED REFERENCE

From 20% to 30%, the difference is 10 percentage points and the relative increase is (30−20)/20 = 50%. In the follow-up from 40% to 50%, the point change stays 10 while the relative increase becomes 25%.

CRITICAL CONDITION
Response patterns are not treated as fixed learner traits and no unmeasured learning gain is claimed.

LIMITS
This is an assessment-design exercise, not an administered test or an evaluation of real students.

This reference is not a learner submission or proof of provider-course completion. See material-verification.json in the production package for actual preparation checks.
