I need help with question 5-8

Natasha, age 38 , currently earns $85,000. Her wage replacement ratio is 85 percent. She expects that inflation will average 3 percent for her entire life expectancy. She expects to earn 6 percent on her investments and retire at age 67 (full retirement age), possibly living to age 94 . Her Social Security retirement benefit in today's dollars is \$14,500 per year, for retiring at full retirement age. Questions 1 through 4: Calculate Natasha's capital needed at retirement at age 67 and the amount she must save at the end of each year, assuming she has no current savings accumulated for retirement. Questions 5 through 8: Calculate the present value of her benefits at ages 64,67 . and 71