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प्रश्न
How much money will Dinu pay for 4 kg brass?
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उत्तर
The rate of 1 kg of brass according to Dinu’s price list = Rs 180
So, Dinu will pay for 4 kg of brass = Rs 180 × 4 = Rs 720
This can be calculated as follows:
| 100 | 80 | |
| 4 | 100 × 4 | 80 × 4 |
| 400 | 320 |
By adding the digits in last row you will get 400 + 320 = 720 Hence, Dinu will pay Rs 720 for 4 kg of brass.
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