After his retirement at the age of 60 , Mr. Sathurshan would want to be able to spend $100k per year. He is planning to practice this lifestyle until the age of 70 years old, for then he shall process with other endeavors. At what age should Mr. Sathurshan starts to accumulate the amount for which it is sufficient to support his lavish lifestyle if he is planning to invest just once? Assume necessary values for the assessment. Take i=10%