A mechanical workshop invested in purchasing a semiautomatic machine for $50,000, that expected to generate a net income of $8,000 starting year 3 and then expected to decrease by 5% per year thereafter. The useful life of the machine is 20 years. If the workshop's minimum attractive rate of return (MARR) is 10% per year, the standard notation for determining the discounted payback period is: 0 0 = -50,000 + 8,000 (P/A, -5%, 10%, np) (P/F, 10%, 3) 0 0 = -50,000 + 8,000 (P/A, 5%, 10%, np - 2) (P/F, 10%, 2) O 0 = -50,000 + 8,000 (P/A, 5%, 10%, np) 0 0 = -50,000 + 8,000 (P/A, -5%, 10%, np - 2) (P/F, 10%, 2) O 0 = -50,000 + 8,000 (P/A, -5%, 10%, np) (P/F, 10%, 2) O None of them 0 0 = -50,000 + 8,000 (P/A, 5%, 10%, np - 3) (P/F, 10%, 3) 0 0 = -50,000 + 8,000 (P/A, -5%, 10%, np - 3) (P/F, 10%, 3)