A student has ₹ 500 in her savings bank account. She gets ₹ 150 every month as pocket money. How much money will she have at the end of every month from the second month onwards? Find a linear expression to represent the amount she will have in the $n^{\text{th}}$ month. [Page No. 23]

End of month 1: 500 + 150 = ₹ 650

End of month 2: ₹ 800;

End of month 3: ₹ 950;

End of month 4: ₹ 1100; .l.

Expression for $n^{\text{th}}$ month:

Amount = 500 + 150n (rupees)

Concept Applied
A quantity that changes by a fixed amount in every unit step follows a linear pattern of the form
 (initial value) + (rate) × (number of steps).