What is the present worth of a promise to pay $1000 at the end of each of the next 10 years if interest is computed at 8 %?

ans:$6,710

A machine will save $40,000 a year in operating const for the next 10 years. Using interest at 12%, what is the present worth of these savings?

ans: $226,000

A $150,000 interest-free loan must be repaid 6 years from now. What uniform sum must be deposited at the end of each of the next 6 years in a fund earning 4% interest to have the $150,000 available to repay the loan?

ans:$22,614

please show worked out solutions, i know these answers are correct