A gold mine is projected to produce $52,000 during its first year of operation, $50,000 the second year, $48,000 the third year, and so on. If the mine is expected to produce for a total of 20 years, and the effective annual interest rate is 4%, its present worth is nearest to Select one: O a. $1,127,810 O b. $679,515 C. $483,566 O d. $456,385 The maintenance cost for a car this year is expected to be $500. The cost will increase $50 each year for the subsequent 9 years. The interest is 6% (nominal). What is the approximate present worth of maintenance for the car over the full 10 years? Select one: O a. $7,285 O b. $10,110 O C. $5,160 O d. $8,110 For the probability density function shown, what is the probability of the random variable X being greater than and less than ? 4 3 f(x)-4x3 f(x) 2 1 0 0.5 Select one a. 03125 b. 0.6875 O C. 0.6836 O d. 0.0039 O