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Percent change (=\dfrac{\text{new} - \text{old}}{\text{old}} \times 100%). Compute the difference: (92 - 80 = 12). Divide by the old value: (\dfrac{12}{80} = 0.15). Convert to a percent: (0.15 \times 100% = 15%). Thus, D is correct. Option A (12%) confuses the numerator with the percentage; B (13%) and C (14%) are near-miss distractors for rounding errors or using the new value in the denominator. TEAS data analysis requires careful identification of the baseline; percent increase is always relative to the original amount unless specified otherwise. A quick check: 10% of 80 is 8; 15% of 80 is 12—exactly the observed gain—confirming 15%. If the problem gave totals and rates, ensure “same total volume” holds; otherwise changes could reflect different denominators. In quality-improvement contexts, distinguish absolute increase (12 appointments) from relative increase (15%), and avoid the common pitfall of computing “percentage points” vs “percent” changes when comparing rates.