1. The initial production was 400 loaves. 2. The production increased by 20%. 3. Calculate the amount of the increase: 20% of 400 = (20/100) * 400. 4. Simplify the calculation: 0.20 * 400 = 80 loaves. 5. Add the increase to the original production to find the total for this week: 400 + 80 = 480 loaves. Why others are wrong: A — This result would occur if the increase was incorrectly calculated as 20 absolute units instead of 20 percent of the original amount. B — This result would occur if the increase was incorrectly calculated, possibly as 10% of 400 (40 loaves) instead of 20%. D — This result would occur if the increase was incorrectly calculated as 25% of 400 (100 loaves), or a similar miscalculation.

1. Calculate January's output: 500 units. 2. Calculate February's output: 10% increase from January. 10% of 500 = 0.10 * 500 = 50 units. February's output = 500 + 50 = 550 units. 3. Calculate March's output: 5% decrease from February. 5% of 550 = 0.05 * 550 = 27.5 units. March's output = 550 - 27.5 = 522.5 units. 4. Calculate March's output as a percentage of January's output: (March's output / January's output) * 100 (522.5 / 500) * 100 = 1.045 * 100 = 104.5%. Why others are wrong: A — Correct. B — Incorrect calculation, likely by applying the 5% decrease to the original January output (550 - 25 = 525; 525/500 = 105%) or assuming a net 5% increase (10% - 5% = 5%). C — Incorrect calculation, possibly from averaging percentage changes or other miscalculation. D — Incorrect calculation, likely only considering the 5% decrease relative to the original January output and ignoring the initial increase.

1. The novel was purchased for $18 after a 20% discount. 2. This means that $18 represents 100% - 20% = 80% of the original price. 3. Let 'X' be the original price of the novel. 4. So, 0.80 * X = $18. 5. To find X, divide $18 by 0.80. 6. X = 18 / 0.80 = $22.50. Why others are wrong: A — This value is obtained by calculating 20% of $18 and adding it to $18, incorrectly assuming $18 is the original price. C — This value would imply a discount of $2 from an original price of $20, which is a 10% discount, not 20%. D — This value would be the original price if the $18 represented a 25% discount (18 / 0.75 = 24), not a 20% discount.

Step 1: Calculate the increase in sales. Increase = 14% of 350 copies Increase = (14/100) * 350 Increase = 0.14 * 350 Increase = 49 copies Step 2: Add the increase to the original sales to find the new total. New sales = Original sales + Increase New sales = 350 + 49 New sales = 399 copies Why others are wrong: A — This is the correct total number of copies sold after the increase. B — This represents only the absolute increase in sales, not the total number of copies sold this month. C — This would be an incorrect decrease, implying the sales went down, and the value itself (350 - 14) does not correspond to a 14% decrease. D — This might result from calculating a 10% increase (350 + 35 = 385) instead of a 14% increase.

1. Let the original price be P. 2. A 15% reduction means the new price is 100% - 15% = 85% of the original price. 3. So, 0.85 * P = $425. 4. To find P, divide the new price by 0.85. 5. P = $425 / 0.85 = $500. Why others are wrong: A — This calculation incorrectly adds 15% of the *new* price ($425) to $425 (i.e., $425 * 1.15). B — This is the correct answer. C — This calculation incorrectly subtracts 15% of the *new* price ($425) from $425 (i.e., $425 * 0.85). D — This option is not derived from correct percentage calculation and likely results from a miscalculation or approximation.