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Question

What is the cost price price of a T.V. whose selling price after continuous discount of 10% and 20% in ₹ 14,400. Explain 


Solution

Let the original price be X
then after 10% discount
the rate is  .9X
then given that again 20% is discounted
so the rate becomes
.9X-20% of .9X
that is
.9X-.18X
=.72X
given that  .72X=14400
so X=20,000
so the original price=X
and that is =20000

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