Twins Barbara and Mary are both age 27. Beginning at age 27, Barbara invests $2000 per year for ten… Show more Twins Barbara and Mary are both age 27. Beginning at age 27, Barbara invests $2000 per year for ten years and then never sets aside another penny. Mary waits ten years and then invests $2000 per year for the next 30 years. Assuming they both earn 7 percent, how much will each twin have at age 67? (Hint: Use Appendixes A.1 and A.3) • Show less