Please arrange to release the amount of $ 25500 because the cash balance in the petty cash fund drops to a sufficiently minimal level.
Please arrange to release the amount of $ 25500 because cash balance in the petty cash becomes low.
Please arrange to release the amount of $ 25500 because amount in the petty cash account has been depleted.
The last sentence is the best. "
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The last sentence is the best. You need "the" before "amount."