Cost of one radio = ₹ 1200
Cost of 40 radios = 1200 x 40 = ₹ 48,000
Now,
Total money with merchant = ₹ 78,592
Money spent by her = – ₹ 48,000
Money left with her = ₹ 30,592
Therefore, ₹30,592 will remain with her after the purchase.
Complete the drawing shown in Fig. 9.14 to indicate where the free ends of the two wires should be joined to make the bulb glow