Hello, looking for help with the following two questions.

1) A bookshop is reducing the price of certain books by 12%.

(i)Work out a formula linking the sale price of a book to its original price.

(ii)If the sale price of a particular book is $66, what was its original price?

2) Use the index laws to simplify the following.

(i) a(9a^2 b)^2 / 3a^4 b^ 3

(i) 4x^-2/y^-3 / xy^2 / 3x^-2

Looking forward to collaborating to solve these issues.

Thanks