DCPIP reduced equations :S

[BurntFaceMan]

okay I'm trying to work out the equation which lands me with the nmol DCPIP reduced, I have the example below but when it asks me to " take the nmol oxidised CCPIP then subtract each value from the zero time value to obtain figures for DCPIP reduced at each time interval"

I'm totally stuck when I use my own numbers. So here is the example the text book gives me:

Time (min)     Absorbance    nmol oxidised DCPIP     nmol DCPIP reduced
0                0.85                    153                   0
1                0.62                    112                   41
2                0.43                     77                    76

Thank you!