Question:
A shopkeeper sells 50 Chemistry, 60 Physics and 35 Maths books on day I and sells 40 Chemistry, 45 Physics and 50 Maths books on day II. If the selling price for each such subject book is ?150 (Chemistry), ? 175 (Physics) and ? 180 (Maths), then find his total sale in two days, using matrix method. If cost price of all the books together is 35,000, what profit did he earn after the sale of two days?