I've tried to answer this question twice, but can't seem to figure out how to find the sinking fund. A break down of steps would be much appreciated!

Sheridan Companyissued $1,020,000,9-year bonds. It agreed to make annual deposits of $81,000to a fund (called a sinking fund), which will be used to pay off the principal amount of the bond at the end of9years. The deposits are made at the end of each year into an account paying4% annual interest.

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