Explanation

Cost Price (CP) = Rs. 27.50  

Selling Price (SP) = Rs. 28.60

Gain = SP - CP = 28.60 - 27.50 = Rs. 1.10

Gain % = (Gain / CP) × 100  

= (1.10 / 27.50) × 100  

= 4%

Explanation

Explanation

Given ratio of red : green : blue balls = 2 : 3 : 5  

Total parts = 2 + 3 + 5 = 10

Green balls = 3 parts

Percentage of green balls = (3 / 10) × 100 = 30% 

Explanation

- Initial sugar percentage = 10%  

- Initial solution weight = 8 kg  

- Sugar = 10% of 8 kg = 0.8 kg  

- Water = 8 kg - 0.8 kg = 7.2 kg

Now, 2 kg of water is added:  

- New total weight = 8 kg + 2 kg = 10 kg  

- Sugar still = 0.8 kg (unchanged)  

New sugar percentage = (0.8 / 10) × 100 = 8%

Answer: 8%

Explanation

To convert a decimal to percentage, multiply by 100:

3.5 × 100 = 350%

Explanation

Price ↑ 25% → Multiply consumption by (1 - x/100) to keep expenditure same.

Solve: 1.25 × (100 - x) = 100 → x = 20%.

Explanation

Take CP as 64% of MP.

SP after 12% discount = 88% of MP.

Gain = SP – CP = 0.88 – 0.64 = 0.24 → Gain % = (0.24/0.64) × 100 = 37.5%.

Explanation

Convert annual rate to half-yearly → 8% ÷ 2 = 4%

Multiply time in years by 2 → 5 × 2 = 10 periods

Apply formula: A = 5000(1.04)¹⁰ = 7401.22

Explanation

60% of 50 = (60/100) × 50 = 30
40% of 30 = (40/100) × 30 = 12

Difference = 30 - 12 = 18

Explanation

Percentage = (90 / 120) × 100

= 75%