Question

A bookseller sells a book at a profit of 20%.Had he bought it at 5% less and sold it for 1.95 more, he would have gained 40% . What did the book cost him​

Answer 1

Answer:

Acids : the substance which is sour in taste is called acids

Bases: The substances which are bitter in taste and soapy to touch is called bases

TO IDENTIFY ACIDS AND BASES TWO TYPES INDICATORS ARE CLASSIFIED

thank u for ur help