Total cost for the trip = $800.
Let x = original number of friends.
Therefore the equally shared cost of the trip for each friend is $800/x.
After 2 friends drop out, the cost for each friend increases to $800/(x-2).
The increase in cost for each remaining friend is $20, therefore

Divide through by 20.

Cross multiply.
x(x - 2) = 80
x² - 2x - 80 = 0
(x + 8)(x - 10) = 0
x = -8 or 10
Reject x = -8 because we cannot have a negative number for friends.
x = 10
Answer: There were 10 friends in the original group.
Answer:
Focus group
Explanation:
Focus group is a small group of people who are introduced in an open discussion for research purpose. In the given question there is a informal session with 6 - 10 customers in which their opinions are considered about a firms products. This is a small group session which is initiated to identify product features and how these customers use these products. This is focus group for research purpose.
Answer:
flexibility
Explanation:
According to classical economists, the price-wage-interest rate flexibility refers to a combination of flexible factors that maintains economic stability:
- Flexible interest rates keeps the money markets (loans) in equilibrium.
- Flexible wages keeps the labor market in equilibrium.
- Flexible prices keeps the goods and services markets in equilibrium.
Therefore, if spending declines, the economy will self-adjust using flexible interest rates (interest rates should lower), flexible wages (wages should lower) and flexible prices (prices should lower) until the economy rebounds.