A stationery shop sells two kinds of notebooks: ruled and plain. Eight ruled notebooks and five plain notebooks together cost ₹155. Five ruled notebooks and three plain notebooks together cost ₹95.
a. (i) Taking the cost of one ruled notebook as x rupees and that of one plain notebook as y rupees, form two linear equations in x and y that model the above information.
b. (ii) Solve the equations obtained in part (i) to find the cost of each type of notebook.
c. (iii) How much will the shop charge for 3 ruled and 4 plain notebooks bought together?