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4.1 Suppose the demand per week for a product is 200 units when the price is...

4.1 Suppose the demand per week for a product is 200 units when the price is $55 per units and 400 units at $49 each. Determine the demand equation, assuming that it is linear.

4.2 A town with a population of 50,000 in 2009 is growing at rate of 8% per year. In other words, at the end of each year the population is 1.08 times the population at the end of the preceding year. Describe the population sequence and determine what the population will be at the end of 2020, if this rate growth is maintained.

4.3   During 2017 the price of a good increased by 12%. In the sales on 1 January 2018 all items are reduced by 20%.   

(a) If the sale price of the good is $850, find the original price at the beginning of 2017.

(b)   Find the overall percentage change.   

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