When the price of candy bars increased from $0.45 to $0.55, the quantity demanded changed from 21,000 per day to 19,000 per day. in this price range, the price elasticity coefficient (based on the midpoint formula) for candy bars is:
1) -1.
2) -2.
3) -0.18.
4) -0.5.

4) -0.5.

Explanation:

The mid point formula for determining the price elasticity coefficient can be calculated using the following formula:

Price elasticity co-efficient=((D2-D1)/(D2+D1/2))/((P2-P1)/(P2+P1/2))

In this question:

D2=19,000, D1=21,000, P2=$0.55, P1=$0.45

Price elasticity co-efficient=((19,000-21,000)/(19,000+21,000/2))/((0.55-0.45)/(0.55+0.45/2))

Price elasticity co-efficient=  -0.50

So based on the above calculation, the answer is 4) -0.5.

the correct answer would be b, when, queen, calder hall and london.

explanation:

we always capitalize words when a paragraph or sentence is starting, when an important name is used, when a place is being written, or simply when a noun is used, etc. so in this sentence, sentence is starting from 'when', so it will be written in capital letters. secondly, queen is considered to be an important person, so it will also be written in capital letter. next, the name of the town is mentioned, i-e calder hall, which will also be written in capital letters. in the last,   city name is being used, 'london', which will also be written in capital letters. so option b is the most appropriate one.

answer; /// i believe the correct answer is ( column break);