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In the context of Figure 4, the P50 cost is represented as âcâ dollars. The P50 estimate is one with equal chance of project overruns or underruns up till when the project scope can be finalised. The P90 value is an estimate of the project cost based on a 90% probability that the cost will not be exceeded.his arises as the P90 cost estimation was adopted at the early stage during project scoping. Had the P50 cost estimate been adopted, there would have been a deviation of $7 million between the actual ($69 million) and budgeted P50 figure ($62 million). The project would have been under-budgeted.
A P800 is also know as a tax calculation. The P800 shows the breakdown of all your taxable income and tax paid. It is common to get a P800 if you make a tax rebate claim, because it is issued by HMRC to each tax payer who pays too much (meaning you are due a tax rebate) or too little tax.The P800 shows your: 1  total income. 2  total tax paid. 3  tax free personal allowance. P800 tax calculation example. In this example we will assume that a tax rebate is owed by HMRC. The figure in THE RESULT box on each years tax calculation are not to be added together as they accumulate each year. So the final amount of tax rebate you will get will be shown on the last tax calculation form.