In solving an arithmetic gradient problem with the gradient decreasing, which is true?
Use the highest amount as the base. Calculate uniform series with that base amount, and then subtract the calculated gradient (wedge).
Use the lowest amount as the base. Calculate uniform series with that base amount, and then subtract the calculated gradient (wedge).
Use the highest amount as the base. Calculate uniform series with that base amount, and then add the calculated gradient (wedge).
Use the lowest amount as the base. Calculate uniform series with that base amount, and then add the calculated gradient (wedge).