Question : A grocery shop is offering a 10% discount on purchasing Rs. 500 and above. A 5% discount is given on the purchase of value above Rs. 250 but below Rs. 500. A discount of an additional 1% is given if payment is made instantly in cash. How much would a customer have to pay by cash if he buys 25 packets of biscuits and one packet is priced at Rs. 30?
Option 1: Rs. 670.25
Option 2: Rs. 668.25
Option 3: Rs. 675
Option 4: Rs. 667.05
Correct Answer: Rs. 668.25
Solution :
Discount offered on purchases of more than Rs. 500 = 10%
Discount offered when payment is made in cash = 1%
Cost of a packet of biscuits = Rs. 30
Cost of 25 packets of biscuits = 30 × 25 = Rs. 750
Since he paid in cash, he would get two consecutive discounts of 10% and 1%.
Final discount % on consecutive discount of $a$% and $b$% = $a+b-\frac{a\times b}{100}$
So, the final discount = $10+1-\frac{10\times1}{100}$ = 10.9%
Now, he would have to pay = $750\times\frac{100-10.9}{100}$ = Rs.668.25
Hence, the correct answer is Rs. 668.25.
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