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A chain of departmental stores has outlets in Delhi, Mumbai, Bengaluru and Kolkata. The sales are categorized by its three departments – ‘Apparel’, ‘Electronics’, and ‘HomeDecor’. An Accountant has been asked to prepare a summary of the 2018 and 2019 sales amounts for an internal report. He has collated partial information and prepared the following table.

The following additional information is known.

1. The sales amounts in the Apparel departments were the same for Delhi and Kolkata in 2018.

2. The sales amounts in the Apparel departments were the same for Mumbai and Bengaluru in 2018. This sales amount matched the sales amount in the Apparel department for Delhi in 2019.

3. The sales amounts in the HomeDecor departments were the same for Mumbai and Kolkata in 2018.

4. The sum of the sales amounts of four Electronics departments increased by the same amount as the sum of the sales amounts of four Apparel departments from 2018 to 2019.

5. The total sales amounts of the four HomeDecor departments increased by Rs 70 Crores from 2018 to 2019.

6. The sales amounts in the HomeDecor departments of Delhi and Bengaluru each increased by Rs 20 Crores from 2018 to 2019.

7. The sales amounts in the Apparel departments of Delhi and Bengaluru each increased by the same amount in 2019 from 2018. The sales amounts in the Apparel departments of Mumbai and Kolkata also each increased by the same amount in 2019 from 2018.

8. The sales amounts in the Apparel departments of Delhi, Kolkata and Bengaluru in 2019 followed an Arithmetic Progression.

Question 10 : What was the increase in sales amount, in Crore Rupees, in the Apparel department of Mumbai from 2018 to 2019?

- 12
- 10
- 5
- 8

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Before we begin solving, let's try to apply the easiest points to the table to see how much info we can get (Key is to apply the easiest looking rules first so that we can get as many missing numbers as possible, not a good idea to apply the rules in the order that they are given)

For now, let us apply points 1, 2, 3, 6 and see how the table looks:

Now let's apply point 5 so that we can get the missing value Z

(100+72+80+54) - (80 + Z + 60 + Z) = 70

306 - 140 - 2(Z) = 70

166 - 2(Z) = 70

2(Z) = 96

Z = 48

This is how the table looks as of now:

Let's continue to solve the table, let's apply point 7 now

Let's apply point 8.

Since Sales for Delhi, Kolkata and Bangalore in 2019 form an AP, the following must be true:

K (2019) - D (2019) = B (2019) - K (2019)

54 - Y = (2Y - X) - 54

108 = 3Y - X …........................(Equation 1)

Finally, let's apply point 4.

(98 + 102 + 70 + 100) - (78 + 82 + 90 + 80) = (Y + 54 + Y - X + 2Y - X + 54) - (X + Y + Y + X)

370 - 330 = (108 + 4Y - 2X) - (2Y + 2X)

40 = 108 + 2Y - 4X

4X - 2Y = 68…........................(Equation 2)

Solve equations 1 and 2

4X - 2Y= 68

12Y - 4X = 432

10Y = 500

Y = 50

X = 42

The finished table looks like this:

With the finished table the increase in sales amount, in Crore Rupees, in the Apparel department of Mumbai from 2018 to 2019 can be found out to be 12.

The question is **"What was the increase in sales amount, in Crore Rupees, in the Apparel department of Mumbai from 2018 to 2019?" **

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