Exercise $5-7($Algo$)$ Solving for unknowns; single amounts $[$LO$5-4]$

For each of the following situations involving single amounts, solve for the unknown. Assume that interest is compounded annually. $(i=$ interest rate, and $n=$ number of years$)$

Note: Use tables, Excel, or a financial calculator. Round your final answers to nearest whole dollar amount. $($FV of $$1,$ PV of $$1,$ FVA of $$1,$ PVA of $$1,$ FVAD of $$1$ and PVAD of $$1)$

$\backslash$table$[[,$Present Value,Future Value,$i,],[1.,$$$,21,279,$$$,42,000,12\%,6],[2.,$$$,30,626,$$$,55,000,,12],[3.,$$$,22,615,$$$,40,500,6\%,],[4.,$$$,41,047,$$$,105,000,,9],[5.,$$$,20,511,,,5\%,15]]$