Which offer is better?
1) Two successive discounts of 10% and 20%
2) Single discount of 30%

1: Two successive discounts of 10% and 20%.

2: A single discount of 30%.

For two successive discounts of a% and b%, the net discount is given by:

​$$\text{Net discount} = a + b - \left( \frac{a \times b}{100} \right)$$​​

For Option 1 (two successive discounts of 10% and 20%):

​$$\text{Net discount} = 10 + 20 - \left( \frac{10 \times 20}{100} \right) = 30 - 2 = 28 \%$$​​

For Option 2 (single discount of 30%):

Discount = 30%

Thus, The single discount of 30% is better, as it gives a higher discount compared to the 28% .