Question : The table given below shows the cost of two fruits in five different shops.
| Shops | Fruits | |
| A | B | |
| P | 75 | 140 |
| Q | 120 | 90 |
| R | 50 | 35 |
| S | 70 | 85 |
| T | 95 | 96 |
What is the difference between the cost of fruits A and B in all five shops together?
Option 1: 24
Option 2: 36
Option 3: 20
Option 4: 48
Correct Answer: 36
Solution :
| Shops | Fruits | ||
| A | B | C b - C a | |
| P | 75 | 140 | 65 |
| Q | 120 | 90 | –30 |
| R | 50 | 35 | –15 |
| S | 70 | 85 | 15 |
| T | 95 | 96 | 1 |
Let C
b
– C
a
be the difference in the cost of fruits in shops A and B.
Adding all the differences, we get $\sum$(C
b
– C
a
) = 65 – 30 – 15 + 15 + 1 = 36
Hence, the correct answer is 36.
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