Assuming that interest is not earned on savings, the annual saving to save  $74,500 with an initial capital of $10,000 is $2,150.
Interest refers to the finance charge or income that is added to a periodic saving.
The interest (simple or compounding) increases the amount of the funds at the end of its maturity period.
We can compute the compound interest using an online finance charge.
Initial investment = $10,000
Investment balance after 30 years = $74,500
To save $74,500 with an initial capital of $10,000 without interest, the annual saving is $2,150 ($74,500 - $10,000)/30.
Thus, assuming that interest is not earned on savings, the annual saving to save  $74,500 with an initial capital of $10,000 is $2,150.
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