Qualified Business Income (QBI) Deduction (LO 4.10)Rob operates a small plumbing supplies business as a sole proprietor. In 2018, the plumbing business has gross business income of $421,000 and business expenses of $267,000, including wages paid of $58,000. The business sold some land that had been held for investment generating a long-term capital gain of $15,000. The business has $300,000 of qualified business property in 2018. Rob's wife, Marie, has wage income of $250,000. They jointly sold stocks in 2018 and generated a long-term capital gain of $13,000. Rob and Marie have no dependents and in 2018, they take the standard deduction of $24,000.The income threshold for QBI limitations starts at $315,000 for married filing jointly taxpayers.a. What is Rob and Marie's taxable income before the QBI deduction?$b. What is Rob and Marie's QBI?$154,000What is Rob and Marie's QBI deduction?$** Please give explanation and not just the answer. Thank you! **