It is known that

- The percentage profit for the store in 2016 was 100%.
- The store’s revenue doubled from 2016 to 2017, and its cost doubled from 2016 to 2018.
- There was no profit from the Electronics department in 2017.
- In 2018, the revenue from the Clothing department was the same as the cost incurred in the Produce department.

- 4 : 3
- 16 : 9
- 9 : 16
- 8 : 5

- 25.0
- 33.3
- 15.5
- 8.3

Let the total revenue in 2016, 2017 and 2018 be 100x, 100y and 100z . The total cost in 2016, 2017 and 2018 be 100a, 100b and 100c.

The information given can be tabulated as below

2016 | 2017 | 2018 | |

Clothing | 20x | 30y | 40z |

Produce | 30x | 40y | 40z |

Electronics | 50x | 30y | 20z |

2016 | 2017 | 2018 | |

CLOTHING | 30a | 30b | 20c |

PRODUCE | 40a | 30b | 30c |

ELECTRONICS | 30a | 40b | 30c |

As revenue doubled in 2017 so 100y = 2(100x)

Or y = 2x

Also cost doubled in 2018 so 100c = 2(100a)

Or c = 2a

It is given that Profit in electronics in 2017 = 0

Which mean 30y = 40b

Percentage profit in 2016 = `100 -> x = 2a

In2018… -> 40z = 50c

Thus z =2.5a, x = 2a, y = 4a, b = 3a, c = 2a

- profit in 2018 = (250a – 200a)/200a x 100 = 25
- Rev produce in 2017/rev produce in 2018 = 40y/40z = 8/5
- profit in 2016 = 100a. Profit from produce = 70a -> 70%
- profit in 2017 = 400a – 300a / 300a = 33.33%

Profit in 2018 = 25%

Difference = 8.3

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