A book cost $ 15 in a shop. if it is bought on the internet , it cost 80 % of this amount . how much does the book cost if it is bought on the internet? ​

Dear student,

Cost Price of book=&15When sold on the internet,Cost=80% of &15=80100 ×&15=810×&15=82×&3=4×&3=&12Thus the cost of a book sold on the internet is &12

Regards

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