The difference between a discount of 25% and two successive discounts of 15% and 20% on a certain bill was ₹28. Find the amount of the bill.

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Let the amount of the bill be ₹x.

1. Discount of 25% means the discount amount is 25% of x = 0.25x.

2. Two successive discounts of 15% and 20% means:
   - First discount: 15% of x = 0.15x, so the amount after first discount = x - 0.15x = 0.85x.
   - Second discount: 20% of 0.85x = 0.20 × 0.85x = 0.17x.
   - Total discount in two successive discounts = 0.15x + 0.17x = 0.32x.

The difference between the two discounts is given as ₹28:

Difference = (Two successive discounts) - (Single discount) = 0.32x - 0.25x = 0.07x = 28

Solving for x:
0.07x = 28
x = 28 / 0.07
x = 400

But this contradicts the options since ₹400 is option 2, but let's re-check the calculation.

Recalculate the total discount for successive discounts:

Amount after first discount = 0.85x
Second discount = 20% of 0.85x = 0.20 × 0.85x = 0.17x
Total discount = First discount + Second discount = 0.15x + 0.17x = 0.32x

Difference = 0.32x - 0.25x = 0.07x = 28
x = 28 / 0.07 = 400

So the amount of the bill is ₹400.

Therefore, the correct answer is ₹400.

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