7. A fast-food chain plans to expand by opening several new restaurants. The chain operates two types of restaurants, drive-through and full-service. A drive-through restaurant costs RM 100.000 to construct,
requires 5 employees, and has an expected annual revenue of RM 200.000. A full service restaurant
costs RM 150.000 to construct, requires 15 employees, and has an expected annual revenue of RM
500,000. The chain has RM 2,400,000 in capital available for expansion. Labor contracts require that
they hire no more than 210 employees, and licensing restrictions require that they open no more than
20 new restaurants.
(a) How many restaurants of each type should the chain open in order to maximize the expected
revenue? [1 point)

≤

Explanation:

                               Drive through                Full Service

Annual revenue          200,000                       500,000

Cost                               100,000                        150,000

Income                           100,000                        350,000

Employee                            5                                   15

Income / employee         20,000                        23,333.33

Using simultaneous equation ,

Let X represent the drive through service  ,and Y represent the full service restaurant

Budget = 100,000x + 150,000y ≤ 2,400,000  (equation 1)

Employer = 5x + 15y ≤ 210   (equation 2)

(Divide equation 1 by 10 ,000)

                     10x+ 15y ≤ 240 (equation 3)

Using elimination method, multiply equation 2 by -2

                      10x +15y ≤240

                      -10x - 30y ≤-420

                        -15y ≤ -180

                             y≤ -180/-15

y = 12

substitute y = 12 in equation 3

10x + 15y≤240

10x +180 ≤240

10x≤240-180

10x≤60

x≤6

12         1,800,000      180

6           600,000         30

6 drive through services and 12 full services should be opened.

                           6 Drive through                12 full service            20

Cost                             600,000                      1,800,000           2,400,000

Employees                      30                                 180

Net income                     600,000                    4,200,000

sound is invisible, but sometimes we can feel it. when a kettle-drum is thumped with a stick that time the tight drum skin moving up and down very quickly for some time and then it pumped sound waves into the air. loudspeakers also work in a similar manner.

components of a speaker:

electromagnet

in order to translate an electrical signal into an audible sound, an electromagnet is used in looudspeakers

  suspension

suspension is used to   center the voice coil in the gap of the magnet and it exerts a restoring force to keep it there. suspension is used to limits the maximum mechanical excursion of the diaphragm and voice coil.

voice coil

voice coil is a coil of wire which is attached to the apex of a loudspeaker cone. it provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.

cone

in a   loudspeaker, a   thin, semi-rigid membrane attached to the voice coil, which moves in a magnetic gap due to which it vibrates   and produced sound. it is known as diaphragm and it can also be called a cone, though not all speaker diaphragms are cone-shaped.

surround

surround is also known as front suspension. surround is used to join the cone to the chassis. together with the suspension it controls the cone excursion, and it is also used to   determine how energy which is   travelling through the cone is absorbed, and how the speaker limits when it reaches the ends of its travel.

dustcap

dustcap is used to protect the voice coil from dust and dirt. it is a part of the cone.

how speaker work

the outer part of the cone is fastened to the outer part of the loudspeaker's circular metal rim. the inner part is fixed to   voice coil that sits just in front of a permanent magnet . when loudspeaker is hooked up to a stereo, electrical signals feed through the speaker cables into the coil. it will convert the coil into an electromagnet magnet . when electricity flows back and forth in the cables, the electromagnet either repels or attract the permanent magnet. this moves the coil back and forth, and it pull and push the loudspeaker cone. like a drum skin vibrating back and forth, the moving cone pumps sounds out into the air.in this way loudspeakers works.

answer; situational irony;