If it is only partially degraded, then the cost of a full repair is multiplied by the percentage of item charge that needs to be repaired to produce the current repair cost.
template = Calculator:Template/Smithing/Armour stand
form = repairForm
result = repairResult
param = level|Smithing level (1-105)|1|int|1-105
param = charge|Item Charge|0.0|number|0.0-100.0
param = cost|cost|3000000|hidden|
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The result will appear here when you submit the form.