A business executive has the option to invest money in two plans: Plan A guarantees
that each dollar invested will earn $.70 a year later, and plan B guarantees that each dollar
invested will earn $2 after 2 years. In plan A, investments can be made annually, and
in plan B, investments are allowed for periods that are multiples of two years only. How
should the executive invest $100,000 to maximize the earnings at the end of 3 years?