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Simulation

Simulation. An Example. A garage hires out cars. It currently owns four cars which are hired out on a daily basis for a number of days. The demand pattern in the past has been as follows. The length of rental is shown below.

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Simulation

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  1. Simulation An Example

  2. A garage hires out cars. It currently owns four cars which are hired out on a daily basis for a number of days. The demand pattern in the past has been as follows

  3. The length of rental is shown below

  4. The company charges £40 a day for hire. It estimates that the total fixed overheads attributed to this operation are £10 a day. If the car is hired out the extra repair and maintenance costs generated are estimated at £6 a car a day.

  5. If the demand for hired cars exceeds the current number of four cars they then hire from another garage at additional cost of £24 a day. Carry out a simulation to forecast the overall demand pattern for car hire and estimate the annual contribution to overheads and profits from the car hire business.

  6. The first thing to do is to construct cumulative frequency tables to decide which random numbers refer to a particular scenario.

  7. This means, for example, that a random number of 17 would interpret as a demand of 1 on that particular day, whilst a value of 95 would imply a demand of 4. The same process is carried out for length of hire.

  8. The length of rental is shown below

  9. We will use the following random numbers (from a book of tables) 84 42 56 73 87 75 18 91 76 66 64 83 97 11 69 41 80 92 38 75 28 87 77 03 57 09 85 86 46 86 40 15 31 81 78 91 30 22 88 58 Generate 10 days of business

  10. Day 1 • Random Number is 84 • This means a demand of 3

  11. Day 1 • We now need to work out how long each car is out for

  12. Length of Rental • Car 1 • Next Random Number is 42 • This corresponds to a duration of 1 day

  13. Length of Rental • Car 2 • Next Random Number is 56 • This corresponds to a duration of 1 day • Car 3 • Next Random Number is 73 • This corresponds to a duration of 2 days

  14. Day 2 • Random Number is 87 • This means a demand of 3

  15. Length of Rental • The next three random numbers are 75, 18 and 91 meaning rental durations of 2, 1 and 3 respectively

  16. This can be carried on for a ten day period and the costs calculated.

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