During the month of july, pittsburgh resident b. fly must make four round-trip flights between pittsburgh and

chicago. the dates of the trips are as shown in table 87. b. fly must purchase four round-trip tickets. without a discounted fare, a round-trip ticket between pittsburgh and chicago costs $500. if fly’s stay in a city includes a weekend, then he gets a 20% discount on the round-trip fare. if his stay in a city is at least 21 days, then he receives a 35% discount; and if his stay is more than 10 days, then he receives a 30% discount. of course, only one discount can be applied toward the purchase of any ticket. formulate and solve an assignment problem that minimizes the total cost of purchasing the four round-trip tickets. (hint: let xij 1 if a round-trip ticket is purchased for use on the ith flight out of pittsburgh and the jth flight out of chicago. also think about where fly should buy a ticket if, for example, x21 1.)

leave pittsburg leave chiago
monday, july 1 friday, july 5
tuesday, july 9 thursday, july 11
monday, july 15 friday, july 19
wednesday, july 24 thursday, july 25

$1,450

Explanation:

I have used the software WinQsb to solve this assignment problem.

Step 1: Run WInQsb and clock on "Network modelling"

Step 2: Open the next window, select "Assignment Problem" and "Minimization", then enter the variables number and constraints number, as shows the attached image 1.

Step 3: Enter the values, considering: 80% (100% - 20%) of $500 is $400; 65% (100% - 35%) of $500 is $325; 70% (100% - 30%) of $500 is $350. See the attached image 2.

Step 4: Go to "Solve and Analyze" and click on "Solve the problem", so you will obtain the results as shows the attached image 3.

Now, you can see that the total cost of purchasing the four round trip minimized costs is $1,450.

Hope this helps!

steering wheels are always situated on the left side of the car.

always drive on the right side of the road.

white lines separate lanes of traffic traveling the same direction.

hashed or broken lines means you may change lanes when it is safe.

solid white lines mean stay in your lane.

yellow lines separate traffic moving in opposing directions.

hashed or broken yellow lines mean you can carefully pass, paying attention to oncoming traffic.

never cross a solid yellow line (or double yellow line).

when turning left at an intersection, pass in front of any cars that are turning left from the opposing direction (do not try to pass behind them).

use the left lane to pass other cars traveling your direction.

do not pass in the right lane unless absolutely necessary.

if you are driving in the far left hand lane and someone would like to pass you, move over to the right lane when it is safe to do so and allow them to pass.

you must always yield to pedestrians.

come to a complete stop whenever you see pedestrians trying to cross the street.

never pass a school bus if it has flashing red lights. wait until the lights have stopped.

be aware of bicyclists. often they share the road with cars and are supposed to also follow general traffic laws.

be particularly careful about driving in cities with bike lanes -- always check before turning that a bike is not coming.

it is mandatory to pull over or stop at an intersection to allow an emergency vehicle to pass you if you see one traveling with lights flashing and/or a siren running.

do not overuse your car horn. horns are used almost exclusively for emergency situations or for when you feel unsafe.

explanation:

don't be her freind because that peson is egnoring you so don't be her freind