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Question
| Dinu's Rate-List | |
| Kind of Junk | Price of 1 Kg |
| 1. Newspaper... | Rs. 6/- |
| 2. Iron... | Rs. 14/- |
| 3. Brass... | Rs. 180/- |
| 4. Plastic... | Rs. 12/- |
| 5. Water paper... | Rs. 4.50/- |
Kiran buys 1 kg iron for Rs 12 but sells it for Rs 14. How much does she earn when she sells 32 kg iron?
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Solution
Kiran earns by selling 1 kg of iron = Rs 14 - Rs 12 = Rs 2
So, she will earn by selling 32 kg of iron = Rs 2 × 32 = Rs 64
This can be calculated as follows also.
| 30 | 2 | |
| 2 | 30 × 2 | 2 × 2 |
| 60 | 4 |
You will get the desired result by adding the numbers in the last row.
Which will be equal to 60 + 4 = 64
Hence, Kiran earns Rs 64 by selling 32 kg of iron.
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Kiran has bought some junk from junk collectors.
Look at the rate list to see today's rates. Help Kiran to find out the cost of the junk.
| Rate-List | |
| Kind of Junk | Price of 1 kg |
| 1. Waste Paper... | Rs. 4/- |
| 2. Newspaper... | Rs. 5/- |
| 3. Iron... | Rs. 12/- |
| 4. Brass... | Rs. 170/- |
| 5. Plastic... | Rs. 10/- |
How much will Kiran pay for a 31 kg newspaper?
First guess the answer and then calculate:
2 × 175 = ?
First guess the answer and then calculate:
4 × 206 = ?
Kiran paid Rs. 919 to the junk collectors. When she sold the junk she got these notes and coins from Dinu.
Now you make a record in her diary.
Find out how much she earned this time.
