Given: Rate of sugar increases by 25% Formula used: Total expenditure = Rate × Consumption Calculation: Let the initial price of sugar be Rs. 100/kg and initial consumption be 100 kg Total expenditure = Rs. 100 × 100 ⇒ Rs. 10,000 Now, New rate of sugar = Rs. 100 × (125/100) ⇒ Rs. 125 New consumption = 10000/125 kg ⇒ 80 kg Decrease in consumption = [(100 – 80)/100] × 100% ⇒ 20% ∴ The decrease in consumption is 20%