12. When a certain product is sold at a price of 40 monetary units, 400 items are sold. Each time the pricedecreases by 0.1 monetary unit, sales increase by 5 units. Denote by x the number of times the priceis decreased by 0.1 monetary units.a. Express p and q in terms of x.b. Express x in terms of p.c. Express q in terms of p.Originally, the revenue is 16 000 monetary units.d. Find for which values of p the company has revenue exceeding 16 000 monetary units.

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Answered: When a certain product is sold at a…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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A man decides which load plan is the best choice if he has an average of 1000.75 min of call in 30 days. Help him choose which plan is the best. Plan X: A fixed fee of £1000 for 30 days for unlimited calls. Plan Y: A fee of £100 for 30 days and a charge of £0.8 per minute (or fractional part) for all calls. Plan Z: A fee of £600 for 30 days, for a total of 30 hours of calls. An additional charge of £0.2 per minute (or fractional part) for all minutes exceeding 30 hours.
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