Let each poor child pay ₹x per month and each rich child pay ₹ y per month.∴20x+5y=90005x+25y=26000In matrix form,​[205​525​][xy​]=[900026000​]AX=B⇒X=A−1 B​⇒​A−1=4751​[25−5​−520​][xy​]=4751​[25−5​−520​][900026000​]=[2001000​]x=200,y=1000​