Shortcut Trick Apply the Successive Percentage Change formula: Net % Change = a + b + (ab/100) Here, a = −12% (Price decrease) and b = +24% (Sales increase). Net Change = −12 + 24 + [(−12 × 24) ÷ 100] Net Change = 12 − 2.88 = 9.12% Since the result is positive, it indicates an Increase in Total Revenue. ∴ The correct answer is Increase 9.12%. Alternate Method Given: Price decrease = 12% | Sales increase = 24% Formula Used: Revenue = Price × Quantity ⇒ Let the initial Price be ₹100 and initial Quantity Sold be 100 units. ⇒ Initial Total Revenue = 100 × 100 = ₹10,000 ⇒ New Price = 100 − 12% of 100 = ₹88 ⇒ New Quantity Sold = 100 + 24% of 100 = 124 units ⇒ New Total Revenue = 88 × 124 = ₹10,912 ⇒ Change in Revenue = 10,912 − 10,000 = ₹912 ⇒ Percentage Change = (912 ÷ 10,000) × 100 = 9.12% ∴ The correct answer is Increase 9.12%. Related Concepts: Successive Percentage Change When a value is changed by x% and then by y%, the effective change is given by [x + y + (xy/100)]%. Revenue and Expenditure Relationship Revenue = Price × Consumption. If the price increases by x%, consumption must decrease by [x/(100+x) × 100]% to keep revenue constant. Successive Discounts Two successive discounts of d_(1)% and d_(2)% are equivalent to a single discount of [d_(1) + d_(2) − (d_(1)d_(2)/100)]%.