Explanation:

Let’s break it down:

- Each scheme offers a pair of successive discounts, not a simple sum.

- To find the real discount, multiply the price after the first discount by the second. Do it step by step.

Scheme (i): 20% and 12%

- After 20% off: Pay 80% of price.

- 12% off on this: Pay 88% of 80% = 0.8 × 0.88 = 0.704.

- So, pay 70.4% of price. Effective discount: 29.6%.

Scheme (ii): 25% and 5%

- After 25% off: Pay 75% of price.

- 5% off on this: Pay 95% of 75% = 0.75 × 0.95 = 0.7125.

- Pay 71.25% of price. Effective discount: 28.75%.

Scheme (iii): 30% and 3%

- After 30% off: Pay 70% of price.

- 3% off on this: Pay 97% of 70% = 0.7 × 0.97 = 0.679.

- Pay 67.9% of price. Effective discount: 32.1%.

- Comparing all, scheme (iii) gives the biggest total discount.

- So, the best deal is Only Scheme (iii).

Only Scheme (iii) is correct.