Paul expects to work for 30 years and he anticipates that his retirement will last for 20 years. His desired annual spending in retirement is $50,000. Assuming a fixed annual rate of 7% during his working years and 5% during his retirement years, what should be Paul's annual contribution during the working years so that he can afford his desired retirement (rounded to the nearest dollar)? OA $75,000 8 $30,852 OC $33,333 OD $18,749 CE 56,597 OF $7.973 OG $18,764