If on a marked price, the difference of selling prices with a discount of 30% and two successive discounts of 20% and 10% is 72, then the marked price (in rupees) ?
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Always carefully calculate the effective discount for successive discounts ($d_1, d_2$): $d_{eff} = d_1 + d_2 - \frac{d_1 d_2}{100}$. Then use this to find the selling price. A single discount of $X\%$ means the selling price is $(100-X)\%$ of the marked price.