f) An employee, currently 57, is considering retiring at the age of 60. She would like to receive at this time - a first benefit in the amount of $ 25,000. Subsequently, on the date of each of her birthdays, in order to preserve her purchasing power, she would like to receive annual benefits indexed at the rate of 6% until the age of 70 inclusively. . Considering that she can invest her money at the effective annual rate of 10%, how much must she invest now in order to be able to receive the desired benefits?