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A reduction of 20% in the price of wheat enables Lalita to buy 5 kg more wheat for j 320. The original rate (in rupees per kg) of wheat was
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- 16
- 18
- 20
- 21
Correct Option: A
Original price of wheat = ₹ x /kg.
New price of wheat
| = ₹ | / kg | 5 |
| ∴ | - | = 5 | ||
| x | ||||
| 5 |
| ⇒ 320 |  | – |  | = 5 | 4x | x |
| ⇒ 320 | | | = 5 | 4x |
| ⇒ | = 5 | 4x |
| ⇒ x = | = ₹ 16 | 4 × 5 |
Aliter : Using Rule 31,
| New price = | 100 × 5 |
| = | = ₹ 12.8 | 100 |
Let the original price be ₹ x per kg
| ⇒ x - | = 12.8 | 100 |
80x = 12.8 × 100
| x = | = 16 per kg | 80 |
