Wade is selling a tractor for $50,000. The buyer can pay $15,000 now, $12,500 next year, $7,500 in two years, and $15,000 in three years. If Wades boss requires an 8% interest rate, should Wade accept the offer? Should Wade accept an offer paying $11,000 per year for 6 years? (The first payment would be one year from the purchase.)