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As the ans is already said by Author, do let us know how you calculated this May be we can see this

Let the total price is. P The amount paid by kamrul : P-13%of P =315 It gives P=362 For the max diff , oishi will get 40 % discount (30 +10) Which is 60%of P So Oishi will pay 217 and the difference is 315-217=98

No it is not net discount that 30+10 is 40 otherwise if some shop gives 90+10 % discount then the product is free Either calculate using formula otherwise do two operation like nullbyte has done above Hope you understand

I have a doubt Is he getting the additional discount on the marked price or on the previous discount?

Things here is like suppose a product is of Rs 100 and it is sold 50%+50% discount, so the first time the price is rs 50 and then the second time price will be 25. Since they have not written here explicitly about MP here, first time price you can think as MP and then after all discount the sale of item you can say SP

y is a multiple of 5. y can’t be 0 because in that case 3x=200 which gives us no integral solution. We take y=5k which makes our equation 3x=200-4*5k => 3x = 200-20k = 20(10-k) = 2*10*(10-k) So it must be a multiple of 10 Correct option E

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