Suppose 30% and 40% of a company's customers are promoters and passives respectively. If half of the detractors leave the company and there are no new customers, the new net promoter score will be:

The table below shows the market share of social media worldwide.

Social Media	Market Share
Facebook	69.22%
Twitter	9.25%
Pinterest	9.22%
YouTube	5.73%
Instagram	3.45%
Others	3.13%

Calculate the Herfindahl Index based on the above data.

The table shows attractions (out of 10) for different mobile phone brands for a target population of five customers.

Customer	Mapple	Huawai	Loppo
1	4	5	6
2	9	8	7
3	6	5	8
4	6	7	2
5	8	9	10

Using the multinomial logit model, what is the market share of Loppo?

Note: Your final answer for this must be rounded up/down to the nearest whole number. Do not include % sign.

For example, if your answer is 25.87%, you should only enter 26 as your final answer.

A firm places 10 advertising insertions in a market with a population of five consumers. The resulting impressions are shown below, where a '1' represents an opportunity-to-see, and '0' signifies that the individual does not have an opportunity to see a particular insertion.

Insertion	A	B	C	D	E
1	1	1	0	0	1
2	1	1	1	0	1
3	1	0	1	0	1
4	0	0	1	0	1
5	1	0	0	0	0
6	0	1	1	0	1
7	0	1	0	0	0
8	1	1	1	0	0
9	1	1	1	0	0
10	1	1	0	0	1

Calculate the gross rating points for this campaign.

In order to promote COVID-19 vaccines, an advertisement in Springfield was placed in both television and social media. At the end of the week, 20,000 individuals watched the television medium and 60,000 individuals saw the advertisement through social media. At the same time, 10,000 individuals watched the advertisement in both mediums. What was the net reach for the advertisement?

Note: Exact answer is required. Do not include separator (i.e., comma). If your answer is 100,000, you should only enter 100000 as your final answer.

The following information is known about the demand for a product at different prices:

If the price is $300, the quantity demanded is 800 units. If the price is $500, the quantity demanded is 400 units.

What is the optimum price, given that the variable cost is $180?