Question:
A mobile phone is bought for ₹ . Its value decreases by ₹ every year.
(A) Find the value of the phone after 3 years.
(B) Make a table of values for t varying from 0 to 8 years and show how the value of the phone, v, depreciates with time.
(C) Find an expression that relates v and t, and explain why it represents linear decay. [Page No. 25]
Answer:
Verified
(A) Value after 3 years =
(B) Table of values:
| (years) | (₹) |
|---|---|
| 0 | 10000 |
| 1 | 9200 |
| 2 | 8400 |
| 3 | 7600 |
| 4 | 6800 |
| 5 | 6000 |
| 6 | 5200 |
| 7 | 4400 |
| 8 | 3600 |
(C) Expression of given problem is given by
It represents linear decay since decreases by a constant amount ₹ 800 per year.
