Q2-a) An investor requires an effective return of at least 15%. What is the minimum annual nominal rate that is acceptable for continuous compounding? [10 Marks] Q2-b) A coal-fired power plant has upgraded an emission control valve. The modification costs only $ 8000 and is expected to last 6 years with a $ 200 salvage value. The maintenance cost is expected to be high at $1700 the first year, increasing geometrically by 11% per year thereafter. Determine the equivalent present worth of the modification and maintenance cost at 8% interest per year. [30