Raju purchase 10 pens for = 150 Rs.
∴ Raju purchases 1 pen for = \(\frac{150}{10}\)
= 15
Manish purchases 7 pens for = 84 Rs.
∴ Manish purchases 1 pen for =\(\frac{ 84}{7}\)
= 12
Thus, Manish got the pens cheaper.
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