Which statements about successive percentage changes are true? Select all that apply.
Starting at 100, a 20% rise followed by a 20% fall ends at 96.✓پاسخ درست
Starting at 250, two successive 10% falls end at 202.50.✓پاسخ درست
Starting at 400, rises of 5% and 15% end at 480.
Starting at 300, a 30% fall followed by a 30% rise ends at 300.
توضیح
The multiplier products are 1.20 × 0.80 = 0.96 and 0.90 × 0.90 = 0.81, giving 96 and 202.50 respectively. The other statements add rates or assume equal opposite rates cancel without checking their different bases.