Question

Seema sold her book to her friend for rupees 99 at 10% loss find the cost price​

Answer 1

Answer:

89.1 Rs

Step-by-step explanation:

10% of 99 is 9.9

She sold the book at 99-9.9=89.1 Rs.

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Answer 2

let Cost price (CP) be X

Selling price (SP) is Rs 99

loss is CP-SP

loss % is (CP-SP)/CP×100%=10%

=> (x-99)/x×100=10

=> (x-99)/X=0.1

=> (x-99)=0.1x

=> 10x-990 = X

=> 10x-x= 990

=> 9x = 990

=> X= 110

THEREFORE, Cost price of her book is Rs 110