equation : i = Prt

The rates offered by a bank on deposits between $10,000 and $24,999 are shown in the following table: How much more interest will an investor earn by placing $20,000 in a 180 -day GIC than by purchasing two consecutive 90-day GICs? (Assume that interest rates do not change over the next 90 days. Remember that interest earned from the first 90-day GIC can be invested in the second 90-day GIC.)