Abookshop sets the marked price of the book 25% higher than its cost, and then sold it at 10% discount
if the selling price of the book is $360, find the cost of the book.
(4 marks)

For a 0.25 pfor b o.3pp (0.25+0.3)=0.28

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.