Paul Has $20,000 to Invest for 6 Months

Short Answer

Paul has $20,000 to invest for 6 months. For this amount, his bank pays 1.3% simple interest on a 90-day GIC and 1.5% on a 180-day GIC. If the interest rate on a 90-day GIC is the same 3 months from now, how much more interest will Paul earn by purchasing the 180-day GIC than by buying a 90-day GIC and then reinvesting its maturity value in a second 90-day GIC?