a. Suppose an investment costing $42000 generates $64 per week in perpetuity. What is the implied interest rate or rate of return? [Express your answer as a percentage. Round your answer to the nearest one-hundredth percentage point. For example, write 5.34 for 5.34%.

b. An investment costing $65,000 has a rate of return 12.75 percent and generates a constant monthly cash flow in perpetuity. The first monthly cash flow is paid immediately. Find the value of the constant monthly cash flow. Do not write any symbol ($, #, &,...). Round your answer to the nearest one-hundredth percentage point. For example, write 1125.34 for $1,125.34.