The total interest received on Rs. a = a × 4 × | r + 2 |
100 |
The total interest paid by Ram to the bank = a × r × | 4 |
100 |
= a × 4 × | r + 2 | – a × r × | 4 | = | 8a | ------ (i) |
100 | 100 | 100 |
The total interest received on Rs. b = b × 4 × | r+ 2 |
100 |
The total interest paid by Shyam to the bank = b × r × | 4 |
100 |
= b × 4 × | r + 2 | – b × r × | 4 | = | 8b | ------ (ii) |
100 | 100 | 100 |
8a | – | 8b | = 400 |
100 | 100 |
= | {1000 × (10 + 13 + 16 + 19 +.... upto 9 terms)} |
100 |
n | {2a + (n – 1) d} |
2 |
→ 10 × | [ | 9 | {2 × 10 + (9 – 1) × 3} | ] |
2 |