hi all,

the formula given is good but i realise that if the next time x123 has
a tyre replacement at location 4, the result is not what i desired.

the scenario:

x123 56 65 4
x123 67 75 1
x123 75 89 4
x123 89 100 4

the result : 100-89=11

can the sumproduct do this ?


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cjjoo
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