1. 25

2. Option 4

3. 70

4. Option 4

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

REVENUE

COST

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