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# The catalogue price of a computer set is Rs.45,000. The shopkeeper gives a discount of 7% on the listed price. He gives a further off-season discount of 4% on the balance. However, Sales Tax at 8% is charged on the remaining amount. Find the amount of Sales Tax a customer has to pay, A. The amount of Sales Tax a customer has to pay = Rs.3,164.08B. The amount of Sales Tax a customer has to pay = Rs.3,214.08C. The amount of Sales Tax a customer has to pay = Rs.3,355.08D. The amount of Sales Tax a customer has to pay = Rs.3,572.08  Hint: First of all, find the discount price given by the shopkeeper and then find the sale price by removing the price of off-season discount from the remaining price after reducing the discount price given by the shopkeeper. Then find 8% of the sale price which is the required amount of Sales Tax which has to be paid by a customer.

Given list price of a computer set = Rs.45,000
Discount given by shopkeeper = 7%
Discount price = 7% of Rs.45,000
$= \dfrac{7}{{100}} \times 45000 = Rs.3,150$
So, the price after discount = list price – discount price
= Rs.45,000 – Rs.3,150
= Rs.41,850
And the shopkeeper gave off-season discount of 4%
Off-season discount price = 4% of Rs.41,850
$= \dfrac{4}{{100}} \times 41850 = Rs.1,674$
So, the sale price after off-season discount = discount price – off-season discount price
= Rs.41,850 – Rs.1.674
= Rs.40,176
Now, the customer has to pay a Sales Tax of 8%.
So, 8% of Rs.40,176 $= \dfrac{8}{{100}} \times 40176 = Rs.3,214.08$
Thus, the amount of Sales Tax a customer has to pay is Rs.3,214.08
Hence the correct option is B. The amount of Sales Tax a customer has to pay = Rs.3,214.08

Note: $x\%$ of $y$ is given by $\dfrac{x}{{100}} \times y$. Most of the students tend to do wrong by calculating the final sale price by subtracting the amount of discount price and off-season price from the listed price at a time. So, don’t make such types of mistakes.

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