The buying price of 5Kg of flour at Rs15 per Kg when 5% sales tax is added, will be:

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Rs.68.75

Rs.78.75

Rs.88.75

None of these

answer is B.

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Detailed Solution

Concept: Use the idea that the purchase price of the 5 kg of flour plus the 5% sales tax will equal the total cost of the 5 kg of flour in this question (buying price of the 5 Kg flour). This will make it easier to approach the issue.
The cost to purchase one kilogramme of flour is Rs. 15.
Therefore, the purchase price of 5 kg of flour is the result of the price per kg and the overall quantity of the flour.
So, 5 (15) = 75 Rs. is the purchase price for the 5 kg of flour.
It is now assumed that the purchase price includes 5% sales tax as well.
Therefore, the purchase price of the 5 kg of flour plus 5% of the purchase price of the 5 kg of flour equals the total price of the 5 kg of flour, including sales tax.
Create a linear equation using the data we have available above, and then the entire cost of the 5 kg of flour, including sales tax, = to the 5 kg of flour's buying price + 5%. (buying price of the 5 Kg flour).
Therefore,
Consequently, the 5 kg of flour cost, including sales tax, =

Thus, the 5 kg of flour cost, including sales tax, was=

Hence, the correct option is 2.

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