(a) Let $2x + 5y - 1 = 0$ and $3x + 2y - 7 = 0$ represent the equations of two lines on which the ants are moving on the ground. Using matrix method, find a point common to the paths of the ants. OR (b) 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 ?