3. Suppose a high schools graduate earns $40,000 per year while a college graduate makes $80,000. Assume these wages will not change over time, and there are no other benefits to going to college. Explicit costs of going to college (tuition, books, supplies, etc.) are $30,000 per year. Ignore the psychic costs. The college education lasts four yea rs. The retirement age is 65. a. Say an 18 year-old decides to obtain college education. What can her annual discount rate be? b. Say a 40 year-old has a discount rate of 5%. Will this person go to college