How is the amount due adjusted for inflation in Options C and D?
Each time the amount due is assessed, an amount for price adjustment is added to the total of the Prices which is the sum of:
The change in the Price for Work Done to Date since the last assessment of the amount due multiplied by (PAF/(1+PAF)) where PAF is the Price Adjustment Factor for the date of the current assessment and
Correcting amounts, not included elsewhere, which arise from changes to indices used for assessing previous amounts for price adjustment