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(a) Find `A^-1`,the inverse of matrix A=`[[5 ,6],[7, 9]]`.
(b) Okello bought 5 physics books and 6 mathematics books for a total of ksh 2440.Ali bought 7 physics books and 9 mathematics books for a total of ksh 3560.
(i)Form a matrix equation to represent the above information.
(ii)use matrix method to find the price of a physics book and that of a mathematics book.
(c) A school bought 36 physics books and 50 mathematics books.A discount of 5 % was allowed on each physics book whereas 8% was allowed on each mathematics book. Calculate the percentage discount on the cost of all the books bought.