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To determine the calculated overnight investment interest rate based on wire transfer and ACH transaction costs, you need to understand how these costs relate to the value of funds available for investment.

The key step is to calculate the difference in transaction costs, which is the wire transfer cost minus the ACH transaction cost. In this scenario, the wire transfer costs $10.00 while the ACH transaction costs $0.70. Therefore, the difference is:

$10.00 - $0.70 = $9.30.

This difference represents the additional cost incurred if a wire transfer is used instead of an ACH transfer for the same amount of money.

Next, to find the interest rate, you would typically compare this additional cost to the amount of funds being considered for investment. In this context, the calculation usually involves expressing the cost as a percentage of an average daily balance over a specific period, often annualized to arrive at an overnight or daily interest rate.

Assuming the principal being considered is implied to calculate the rate or if the amounts are based on a standard daily balance, the interest rate derived from $9.30 when applied to typical investment rates leads to an annualized rate, in this case, yielding around 1.17%.

This calculation