**Given Data:**
- Marked price of the sari: Rs. 700
- Successive discounts: 20%, 25%, and 30%

**Solution:**

To find the selling price of the sari after successive discounts, we need to calculate the discounted price at each stage and then multiply them to get the final selling price.

**Step 1: First Discount of 20%**

To calculate the first discount, we need to find 20% of the marked price.

Discounted price after the first discount = Marked price - 20% of marked price

Discounted price after the first discount = 700 - (20/100) * 700

Discounted price after the first discount = 700 - 140

Discounted price after the first discount = 560

**Step 2: Second Discount of 25%**

To calculate the second discount, we need to find 25% of the discounted price after the first discount.

Discounted price after the second discount = Discounted price after the first discount - 25% of discounted price after the first discount

Discounted price after the second discount = 560 - (25/100) * 560

Discounted price after the second discount = 560 - 140

Discounted price after the second discount = 420

**Step 3: Third Discount of 30%**

To calculate the third discount, we need to find 30% of the discounted price after the second discount.

Discounted price after the third discount = Discounted price after the second discount - 30% of discounted price after the second discount

Discounted price after the third discount = 420 - (30/100) * 420

Discounted price after the third discount = 420 - 126

Discounted price after the third discount = 294

Therefore, the selling price of the sari after successive discounts of 20%, 25%, and 30% on the marked price of Rs. 700 is Rs. 294.