Explanation

If price increases by 20%, new price = 120% of old price.  

To keep expenditure same, consumption must decrease to 100/120 = 5/6 = 83.33% of original.  

Reduction = 100% - 83.33% = 16.66% 

Explanation

Given a 12.5% reduction, the new price is 87.5% of the original price.

So,  

87.5% of x = 4375  

(87.5 / 100) × x = 4375  

0.875 × x = 4375  

Now, solve for x:  

x = 4375 / 0.875  

x = 5000

Explanation

Use the formula:

% decrease = (increase ÷ (100 + increase)) × 100

= (25 ÷ 125) × 100 = 20%

So, to keep the total expenditure the same, consumption must decrease by 20%.

Explanation

 80% of 40:  

= (80/100) × 40  

= 0.8 × 40  

= 32

2. 4/5 of 25:  

= (4/5) × 25  

= 20

3. Difference:  

32 − 20 = 12

Explanation

Total marks obtained = 75 + 85 + 90 = 250  

Total marks = 300

Percentage = (250 / 300) × 100 = 83.33%

Explanation

Let the number be x.

20% of x = 18

0.20x = 18

x = 18 / 0.20

x = 90

Explanation

20% of a number = 18  

⇒ (20/100) × number = 18  

⇒ number = 18 × (100/20) = 90

Explanation

Explanation

Let's calculate:

15% of 80 = 0.15 × 80 = 12

20% of 70 = 0.20 × 70 = 14

12 + 14 = 26

Explanation