Herman and Grace Rohrbach are in their mid-thirties. They are reasonably well off financially insofar as Grace's mother has established a trust fund to educate their two children, Barbara and Frances. The Rohrbachs lead rather simple lives and have no desires for lavish spending. However, they do face one major financial challenge: how to have sufficient resources in their retirement years. Herman owns his own camera shop and Grace has no employment income, although she often works in Herman's store. The Rohrbachs have accumulated around $50,000 in savings, which is invested in a bond mutual fund, currently earning 5 percent after taxes. They have no other savings pro-grams, either personal or through the business. If Herman retired today, his only income would be Social Security, which he estimates to be $18,000 annually. He would sell the business immediately prior to retirement. He has no idea what it will be worth then, but he believes he could get $100,000 for it today. To live a comfortable retirement, the Rohrbachs think they need an annual income comparable to their current one, which is $60,000 after income taxes. The Rohrbachs clearly need help to determine if they need to increase their annual savings to meet their retirement goal. Finally, the Rohrbachs will live off Social Security and interest from accumulated savings available at retirement. They will not touch any principal in their savings accounts, preferring instead to leave that money to their children. Retirement is planned in 30 years.

3. Herman has a very good location for his camera shop and can renew the lease indefinitely into the future. Suppose that its value increases by 10 percent annually over the next 30 years. How much will it then be worth?